Tudóstér: Hajdu Lajos publikációi

Bertók, C., Hajdu, L.: The resolution of three exponential Diophantine equations in several variables.
J. Number Theory. 260 29-40, 2024.

Bérczes, A., Hajdu, L., Luca, F., Pink, I.: Additive Diophantine Equations with Binary Recurrences, S-Units and Several Factorials.
Results Math. 78 (4), 1-32, 2023.

Hajdu, L., Tijdeman, R., Varga, N.: Diophantine equations for Littlewood polynomials.
Acta Arith. 210 223-234, 2023.

Hajdu, L., Herendi, O.: Extrema of polynomials with real roots and Diophantine equations.
J. Number Theory. 242 626-646, 2023.

Hajdu, L., Tijdeman, R., Varga, N.: On polynomials with only rational roots.
Mathematika. 69 (3), 867-878, 2023.

Hajdu, L., Sebestyén, P.: Terms of recurrence sequences in the solution sets of norm form equations.
Arch. Math. 122 179-187, 2023.

Hajdu, L., Tijdeman, R.: The Diophantine equation f(x)=g(y)$f(x)=g(y)$ for polynomials with simple rational roots.
J. Lond. Math. Soc.-Second Ser. 108 (1), 309-339, 2023.

Hajdu, L., Varga, N.: Diophantine equations for polynomials with restricted coefficients, I (Power values).
Bull. Aust. Math. Soc. 106 (2), 254-263, 2022.

Ceko, M., Hajdu, L., Tijdeman, R.: Error Correction for Discrete Tomography.
Fundam. Inform. 189 (2), 91-112, 2022.

Győry, K., Hajdu, L., Sárközy, A.: On additive and multiplicative decompositions of sets of integers composed from a given set of primes, I (Additive decompositions).
Acta Arith. 202 (1), 29-42, 2022.

Hajdu, L., Sebestyén, P.: Terms of recurrence sequences in the solution sets of generalized Pell equations.
Int. J. Number Theory. 18 (07), 1605-1612, 2022.

Hajdu, L., Papp, Á., Tijdeman, R.: The Prouhet-Tarry-Escott problem, indecomposability of polynomials and Diophantine equations.
Ramanujan J. 58 (4), 1075-1093, 2022.

Hajdu, L., Papp, Á.: Uniform bounds for the number of powers in arithmetic progressions.
Rev. Real Acad. Cienc. Exactas Fis. Nat. Ser. A-Mat. 116 (4), 1-7, 2022.

Hajdu, L., Papp, Á.: Correction to: Polynomial values of products of terms from an arithmetic progression.
Monatsh. Math. 195 (2), 377-377, 2021.

Hajdu, L., Varga, A.: Engineering Mathematics: part I..
Debreceni Egyetemi Kiadó, Debrecen, 154 p., 2021. ISBN: 9789633189030

Győry, K., Hajdu, L., Sárközy, A.: On additive and multiplicative decompositions of sets of integers with restricted prime factors, I. (Smooth numbers).
Indag. Math.-New Ser. 32 (2), 365-374, 2021.

Győry, K., Hajdu, L., Sárközy, A.: On additive and multiplicative decompositions of sets of integers with restricted prime factors, II: Smooth numbers and generalizations.
Indag. Math.-New Ser. 32 (4), 813-823, 2021.

Hajdu, G., Hajdu, L.: On the Liouville function on rational polynomial values.
Acta Arith. 201 (2), 119-130, 2021.

Hajdu, L., Herendi, O.: Polynomial values of surface point counting polynomials.
Int. J. Number Theory. 17 (01), 15-32, 2021.

Hajdu, L., Tengely, S.: Powers in arithmetic progressions.
Ramanujan J. 55 (3), 965-986, 2021.

Bérczes, A., Hajdu, L., Tijdeman, R.: Skolem's conjecture confirmed for a family of exponential equations, II.
Acta Arith. 197 (2), 129-136, 2021.

Hajdu, L., Luca, F., Tijdeman, R.: Skolem's conjecture confirmed for a family of exponential equations, III.
J. Number Theory. 224 41-49, 2021.

Hajdu, L., Sárközy, A.: On multiplicative decompositions of polynomial sequences, III.
Acta Arith. 193 (2), 193-216, 2020.

Hajdu, L.: On special extrema of polynomials with applications to Diophantine problems.
Res. Number Theory. 6 (1), 1-14, 2020.

Hajdu, L., Varga, N.: Polynomial values of figurate numbers.
J. Number Theory. 214 79-99, 2020.

Hajdu, L., Papp, Á.: Polynomial values of products of terms from an arithmetic progression.
Monatsh. Math. 193 (3), 637-655, 2020.

Bazsó, A., Hajdu, L.: Polynomial values of sums of hyperbolic binomial coefficients.
Funct. Approx. Comment. Math. 63 (1), 95-112, 2020.

Hajdu, L., Tijdeman, R.: Skolem's conjecture confirmed for a family of exponential equations.
Acta Arith. 192 (1), 105-110, 2020.

Hajdu, L., Sebestyén, P.: Sums of S-units in the solution sets of generalized Pell equations.
Arch. Math. 115 (3), 279-287, 2020.

Hajdu, L., Harangi, B., Tiba, A., Hajdu, A.: Detecting Periodicity in Digital Images by the LLL Algorithm.
In: Progress in Industrial Mathematics at ECMI 2018. Ed.: István Faragó, Ferenc Izsák, Péter L. Simon, Springer, Cham, 613-619, 2019, ( Mathematics in Industry ; 30.)( The European Consortium for Mathematics in Industry ; 30.) ISBN: 9783030275495

Hajdu, A., Tijdeman, R., Hajdu, L.: Finding well approximating lattices for a finite set of points.
Math. Comput. 88 (315), 369-387, 2019.

Bérczes, A., Dujella, A., Hajdu, L., Saradha, N., Tijdeman, R.: Products of factorials which are powers.
Acta Arith. 190 (4), 339-350, 2019.

Bérczes, A., Hajdu, L., Pink, I., Rout, S.: Sums of S-units in recurrence sequences.
J. Number Theory. 196 353-363, 2019.

Bertók, C., Hajdu, L.: A Hasse-type principle for exponential Diophantine equations over number fields and its applications.
Monatsh. Math. 187 (3), 425-436, 2018.

Hajdu, L., Papp, Á.: On asymptotic density properties of the sequence (n!).
Acta Arith. 184 (4), 317-340, 2018.

Hajdu, L., Papp, Á., Szakács, T.: On the equation A!B! =C!.
J. Number Theory. 187 160-165, 2018.

Bertók, C., Győry, K., Hajdu, L., Schinzel, A.: On the smallest number of terms of vanishing sums of units in number fields.
J. Number Theory. 192 328-347, 2018.

Bazsó, A., Bérczes, A., Hajdu, L., Luca, F.: Polynomial values of sums of products of consecutive integers.
Monatsh. Math. 187 (1), 21-34, 2018.

Fuchs, C., Hajdu, L.: 30 years of collaboration.
Period. Math. Hung. 74 (2), 255-274, 2017.

Hajdu, L., Tijdeman, R.: Consistency conditions for discrete tomography.
Fundam. Inform. 155 (4), 425-447, 2017.

Bertók, C., Hajdu, L., Pink, I., Rábai, Z.: Linear combinations of prime powers in binary recurrence sequences.
Int. J. Number Theory. 13 (261), [1-12], 2017.

Hajdu, A., Harangi, B., Besenczi, R., Lázár, I., Emri, G., Hajdu, L., Tijdeman, R.: Measuring regularity of network patterns by grid approximations using the LLL algorithm.
In: Proceedings of the 23rd International Conference on Pattern Recognition (ICPR 2016), Cancun, Mexico, 2016, IEEE, [Piscataway], 1524-1529, 2017. ISBN: 9781509048472

Hajdu, L., Szikszai, M., Ziegler, V.: On arithmetic progressions in Lucas sequences.
J. Integer Seq. 2017 (20), Article 17, 2017.

Bertók, C., Hajdu, L., Pethő, A.: On the distribution of polynomials with bounded height.
J. Number Theory. 179 172-184, 2017.

Bertók, C., Hajdu, L., Luca, F., Sharma, D.: On the number of non-zero digits of integers in multi-base representations.
Publ. Math. Debr. 90 (1-2), 181-194, 2017.

Bertók, C., Hajdu, L.: A Hasse-type principle for exponential Diophantine equations and its applications.
Math. Comput. 85 (298), 849-860, 2016.

Hajdu, A., Tomán, H., Kovács, L., Hajdu, L.: Composing ensembles by stochastic approach under execution time constraint.
In: Proceedings of the 23rd International Conference on Pattern Recognition (ICPR 2016), Cancun, Mexico, 2016, IEEE, [Piscataway], 222-227, 2016.

Bérczes, A., Dujella, A., Hajdu, L., Tengely, S.: Finiteness results for F-Diophantine sets.
Monatsh. Math. 180 (3), 469-484, 2016.

Aszalós, L., Hajdu, L., Pethő, A.: On a correlational clustering of integers.
Indag. Math.-New Ser. 27 (1), 173-191, 2016.

Hajdu, L., Saradha, N.: On generalizations of problems of Recaman and Pomerance.
J. Number Theory. 162 552-563, 2016.

Bérczes, A., Hajdu, L., Miyazaki, T., Pink, I.: On the Diophantine equation 1+x^a+z^b=y^n.
J. Comb. Number Theory. 8 (2), 145-154, 2016.

Bérczes, A., Hajdu, L., Miyazaki, T., Pink, I.: On the equation 1^k+2^k+...+x^k=y^n for fixed x.
J. Number Theory. 163 43-60, 2016.

Hajdu, L., Laishram, S., Szikszai, M.: Perfect powers in products of terms of elliptic divisibility sequences.
Bull. Aust. Math. Soc. 94 (03), 395-404, 2016.

Hajdu, L., Laishram, S., Tengely, S.: Power values of sums of products of consecutive integers.
Acta Arith. 172 333-349, 2016.

Győry, K., Hajdu, L., Tijdeman, R.: Representation of finite graphs as difference graphs of S-units. II.
Acta Math. Hung. 149 (2), 423-447, 2016.

Hajdu, L., Szikszai, M.: Common factors in series of consecutive terms of associated Lucas and Lehmer sequences.
Fibonacci Q. 53 (3), 221-229, 2015.

Brunetti, S., Dulio, P., Hajdu, L., Peri, C.: Ghosts in Discrete Tomography.
J. Math. Imaging Vis. 53 (2), 210-224, 2015.

Hajdu, L.: On a conjecture of Schäffer concerning the equation 1^k + ... + x^k = y^n.
J. Number Theory. 155 129-138, 2015.

Ćustić, A., Hajdu, L., Kreso, D., Tijdeman, R.: On conjectures and problems of Ruzsa concerning difference graphs of S-units.
Acta Math. Hung. 146 (2), 391-404, 2015.

Bérczes, A., Hajdu, L., Hirata-Kohno, N., Kovács, T., Pethő, A.: A key exchange protocol based on Diophantine equations and S-integers.
JSIAM Letters. 6 (0), 85-88, 2014.

Akiyama, S., Aszalós, L., Hajdu, L., Pethő, A.: Correlation clustering of graphs and integers.
Infocommun. j. 6 (4), 3-12, 2014.

Hajdu, L., Ziegler, V.: Distinct unit generated totally complex quartic fields.
Math. Comput. 83 (287), 1495-1512, 2014.

Hajdu, L., Pintér, Á., Tengely, S., Varga, N.: Equal values of figurate numbers.
J. Number Theory. 137 130-141, 2014.

Hajdu, L., Szikszai, M.: On common factors within a series of consecutive terms of an elliptic divisibility sequence.
Publ. Math. Debr. 84 (1-2), 291-301, 2014.

Hajdu, L., Pink, I.: On the Diophantine equation 1+2^a+x^b=y^n.
J. Number Theory. 143 1-13, 2014.

Győry, K., Hajdu, L., Tijdeman, R.: Representation of finite graphs as difference graphs of S-units, I.
J. Comb. Theory Ser. A. 127 (1), 314-335, 2014.

Dombek, D., Hajdu, L., Pethő, A.: Representing algebraic integers as linear combinations of units.
Period. Math. Hung. 68 (2), 135-142, 2014.

Bérczes, A., Dujella, A., Hajdu, L.: Some Diophantine properties of the sequence of S-units.
J. Number Theory. 138 48-68, 2014.

Hajdu, L., Kovács, T., Pethő, A., Pohst, M.: An optimization problem for lattices.
Exp. Math. 22 (4), 443-455, 2013.

Hajdu, L., Tijdeman, R.: Bounds for Approximate Discrete Tomography Solutions.
SIAM Discret. Math. 27 (2), 1055-1066, 2013.

Dalen, B., Hajdu, L., Tijdeman, R.: Bounds for discrete tomography solutions.
Indag. Math.-New Ser. 24 (2), 391-402, 2013.

Batenburg, K., Fortes, W., Hajdu, L., Tijdeman, R.: Bounds on the quality of reconstructed images in binary tomography.
Discret Appl. Math. 161 (15), 2236-2251, 2013.

Hajdu, A., Hajdu, L., Kovács, L., Tomán, H.: Diversity measures for majority voting in the spatial domain.
In: Hybrid Artificial Intelligent Systems : 8th International Conference, HAIS 2013, Salamanca, Spain, September 11-13, 2013. Proceedings, Springer-Verlag, Berlin Heidelberg, 314-323, 2013, (Lecture Notes in Artificial Intelligence, ISSN 0302-9743 ; 8073) ISBN: 9783642408458

Hajdu, A., Hajdu, L., Jónás, Á., Kovács, L., Tomán, H.: Generalizing the majority voting scheme to spatially constrained voting.
IEEE Trans. Image Process. 22 (11), 4182-4194, 2013.

Kovács, L., Hajdu, L.: High Performance Computing With Mathematical Applications.
In: WSPS 2013.: 1st Winter School of PhD Students in Informatics and Mathematics, Tradeorg Nyomdaipari és Kereskedelmi Kft, Balatonalmádi, 13, 2013. ISBN: 9789638800121

Hajdu, A., Hajdu, L., Tijdeman, R.: Approximation of the Euclidean Distance by Chamfer Distances.
Acta Cybern. 20 (3), 399-417, 2012.

Hajdu, L., Saradha, N.: Disproof of a conjecture of Jacobsthal.
Math. Comput. 81 (280), 2461-2471, 2012.

Tomán, H., Kovács, L., Jónás, Á., Hajdu, L., Hajdu, A.: Generalized Weighted Majority Voting with an Application to Algorithms Having Spatial Output.
In: Hybrid Artificial Intelligent Systems. Ed.: Emilio Corchado, Václav Snášel, Ajith Abraham, Michał Woźniak, Manuel Graña, Sung-Bae Cho, Springer-Verlag Berlin Heidelberg, Heidelberg, 56-67, 2012, (Lecture Notes in Computer Science ; 7209) ISBN: 9783642289309

Hajdu, L., Saradha, N., Tijdeman, R.: On a conjecture of Pomerance.
Acta Arith. 155 (2), 175-184, 2012.

Hajdu, L., Szikszai, M.: On the GCD-s of k consecutive terms of Lucas sequences.
J. Number Theory. 132 (12), 3056-3069, 2012.

Hajdu, L., Tijdeman, R.: Representing integers as linear combinations of power products.
Arch. Math. 98 (6), 527-533, 2012.

Tomán, H., Kovács, L., Jónás, Á., Hajdu, L., Hajdu, A.: A Generalization of Majority Voting Scheme for Medical Image Detectors.
In: Hybrid Artificial Intelligent Systems : 6th international conference, HAIS 2011, Wroclaw, Poland, May 23-25, 2011; proceedings. Eds.: Emilio Corchado, Marek Kurzynski, Michal Wozniak, Springer, Heidelberg [etc.], 189-196, 2011, (Lecture Notes in Computer Science ; 6679.) ISBN: 9783642212215

Hajdu, L., Kovács, T.: Almost fifth powers in arithmetic progression.
J. Number Theory. 131 (10), 1912-1923, 2011.

Batenburg, K., Fortes, W., Hajdu, L., Tijdeman, R.: Bounds on the Difference between Reconstructions in Binary Tomography.
In: Discrete Geometry for Computer Imagery : 16th IAPR International Conference, DGCI 2011, Nancy, France, April 6-8, 2011. Proceedings / [edited by] Isabelle Debled-Rennesson, Eric Domenjoud, Bertrand Kerautret, Philippe Even, Springer, New York, 369-380, 2011, (Lecture Notes in Computer Science ; 6607.) ISBN: 9783642198663

Győry, K., Hajdu, L., Tijdeman, R.: Irreducibility criteria of Schur-type and Pólya-type.
Monatsh. Math. 163 (4), 415-443, 2011.

Hajdu, L., Saradha, N.: On a problem of Recaman and its generalization.
J. Number Theory. 131 (1), 18-24, 2011.

Bérczes, A., Dujella, A., Hajdu, L., Luca, F.: On the size of sets whose elements have perfect power n-shifted products.
Publ. Math.-Debr. 79 (3/4), 325-339, 2011.

Hajdu, L., Tijdeman, R.: Representing integers as linear combinations of powers.
Publ. Math.-Debr. 79 (3/4), 461-468, 2011.

Bérczes, A., Hajdu, L., Pethő, A.: Arithmetic progressions in the solution sets of norm form equations.
Rocky Mt. J. Math. 40 (2), 383-396, 2010.

Hajdu, L., Saradha, N.: On a problem of Pillai and its generalizations.
Acta Arith. 144 (4), 323-347, 2010.

Hajdu, L., Luca, F.: On the length of arithmetic progressions in linear combinations of S-units.
Arch. Math. 94 (4), 357-363, 2010.

Hajdu, L., Tengely, S.: Arithmetic progressions of squares, cubes and n-th powers.
Funct. Approx. Comment. Math. 41 (2), 129-138, 2009.

Hajdu, L., Tijdeman, R., Tengely, S.: Cubes in products of terms in arithmetic progression.
Publ. Math. Debrecen. 74 (1-2), 215-232, 2009.

Hajdu, L., Schinzel, A., Skałba, M.: Multiplicative properties of sets of positive integers.
Arch. Math. 93 (3), 269-276, 2009.

Hajdu, L.: Optimal systems of fundamental S-units for LLL-reduction.
Period. Math. Hung. 59 (1), 79-105, 2009.

Hajdu, L., Kovács, T.: Parallel LLL-reduction for bounding the integral solutions of elliptic Diophantine equations.
Math. Comput. 78 (266), 1201-1210, 2009.

Győry, K., Hajdu, L., Pintér, Á.: Perfect powers from products of consecitive terms in arithmetic progression.
Compos. Math. 145 (4), 845-864, 2009.

Ádám, Z., Hajdu, L., Luca, F.: Representing integers as linear combinations of S-units.
Acta Arith. 138 101-107, 2009.

Hajdu, L., Tijdeman, R., Schlickewei, H., Schmidt, K., Tichy, R.: A criterion for polynomials to divide infinitely many k-nomials.
In: Diophantine Approximations. Ed.: H. P. Schlickewei, K. Schmidt, R. F. Tichy, Springer-Verlag, New York, 211-220, 2008.

Hajdu, L., Tijdeman, R., Herman, G., Kuba, A.: Algebraic discrete tomography.
In: Advances in discrete tomography and its applications. Ed.: Gabor T. Herman, Attila Kuba, Birkhäuser, Boston, 55-81, 2007, (Applied and numerical harmonic analysis) ISBN: 9780817636142

Hajdu, L.: Arithmetic progressions in linear combinations of S-units.
Period. Math. Hung. 54 (2), 175-181, 2007.

Hajdu, A., Tijdeman, R., Hajdu, L.: General neighborhood sequences in Zn.
Discrete Appl. Math. 155 (18), 2507-2522, 2007.

Hajdu, G., Hajdu, L.: Hosszú's equation over the Gaussian and Eisenstein integers.
Aequ. Math. 75 (1-2), 65-74, 2007.

Fazekas, A., Hajdu, A., Hajdu, L.: Properties of a natural ordering relation for octagonal neighborhood sequences.
In: 5th International Symposium on Image and Signal Processing and Analysis, IEEE Computer Society, Istanbul, 168-173, 2007.

Bruin, N., Győry, K., Hajdu, L., Tengely, S.: Arithmetic progressions consisting of unlike powers.
Indag. Math.-New Ser. 17 (4), 539-555, 2006.

Hajdu, A., Hajdu, L.: On the lattice structure of subsets of octagonal neighborhood sequences in Zn.
In: Discrete geometry for computer imagery: 13th international conference, DGCI 2006, Szeged, Hungary, October 25-27, 2006 : proceedings / Attila Kuba, László G. Nyúl, Kálmán Palágyi (eds.), Springer, Berlin, Heidelberg, 211-222, 2006, (Lecture notes in computer science, ISSN 0302-9743, 4245/2006)

Bennett, M., Bruin, N., Győry, K., Hajdu, L.: Powers from Products of Consecutive Terms in Arithmetic Progression.
Proc. London Math. Soc. 92 (2), 273-306, 2006.

Győry, K., Hajdu, L., Saradha, N.: Correction to: On the Diophantine Equation n(n + d) · · · (n + (k - 1)d) = byl.
Can. Math. Bul.-Bul. Can. Math. 48 (4), 636, 2005.

Hajdu, A., Fazekas, A., Hajdu, L.: Lattices of metrical neighborhood sequences.
In: Joint Hungarian-Austrian Conference on Image Processing and Pattern Recognition (HACIPPR 2005), Veszprém, Hungary, 11-13. May, 2005, [s.n.], [s.l.], 143-147, 2005.

Fazekas, A., Hajdu, A., Hajdu, L.: Metrical neighborhood sequences in Zn.
Pattern Recognit. Lett. 26 (13), 2022-2032, 2005.

Hajdu, A., Hajdu, L., Tóth, T.: Properties and Applications of Neighborhood Sequences.
In: Third Hungarian Conference on Computer Graphics and Geometry, Budapest, Hungary, 17-18. November, 2005

Hajdu, A., Hajdu, L.: Analytical and approximation properties of neighborhood sequences.
In: Képfeldolgozók és alakfelismerők IV. konferenciája : Miskolc-Tapolca, 2004. január 28-30, NJSZT-KÉPAF, Budapest, 97-105, 2004.

Hajdu, A., Hajdu, L.: Approximating the euclidean distance using nonperiodic neighbourhood sequences.
Disc. Math. 283 (1-3), 101-111, 2004.

Győry, K., Hajdu, L., Saradha, N.: On the Diophantine Equation n(n+d)...(n+(k-1)d)=byl.
Can. Math. Bul.-Bul. Can. Math. 47 (3), 373-388, 2004.

Hajdu, L.: Perfect powers in arithmetic progression. A note on the inhomogeneous case.
Acta Arith. 113 (4), 343-349, 2004.

Győry, K., Hajdu, L., Pintér, Á., Schinzel, A.: Polynomials dertermined by a few of their coefficients.
Indag. Math.-New Ser. 15 (2), 209-221, 2004.

Fazekas, A., Hajdu, A., Hajdu, L.: Lattice of generalized neighbourhood sequences in nD.
In: ISPA 2003 : proceedings of the 3nd International Symposium on Image and Signal Processing and Analysis : Rome, Italy, September 18-20, 2003, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia, 107-111, 2003.

Hajdu, A., Hajdu, L.: Velocity and distance of neighbourhood sequences.
Acta Cybern. 16 (1), 133-145, 2003.

Fazekas, A., Hajdu, L., Hajdu, A.: Lattice of generalized neighbourhood sequences in nD and (infinite)D.
Publ. Math. Debrecen. 60 405-427, 2002.

Hajdu, L., Tijdeman, R.: Algebraic aspects of discrete tomography.
J. Reine Angew. Math. 2001 (534), 119-128, 2001.

Fazekas, A., Hajdu, A., Hajdu, L.: Analyzing the structure of the set of neighbourhood sequences.
In: 5th international conference on applied informatics : January 28-February 3, 2001 Eger, Hungary. Szerk.: Kovács Emőd, Winkler Ferenc, Molnár és Társa 2001 Kft, Eger, 41-48, 2001.

Fazekas, A., Hajdu, A., Hajdu, L.: Properties of generalized neighbourhood sequences in finite dimension.
In: 4th international conference on applied informatics : Education and other fields of applied informatics : Computer graphics : Computer statistics and modeling : August 30-September 3, 1999 Eger-Noszvaj, Hungary. Szerk.: Kovács Emőd, Winkler Zoltán, Molnár és Társa`2001` Kft, Eger, 129-134, 2001.

Hajdu, L., Pintér, Á.: Combinatorial diophantine equations.
Publ. Math. Debrecen. 56 (3/4), 391-403, 2000.

Hajdu, L., Szalay, L.: On the Diophantine Equations (2n-1)(6n-1)=x2 and (an-1)(akn-1)=x2.
Period. Math. Hung. 40 (2), 141-145, 2000.

Fazekas, A., Hajdu, A., Hajdu, L.: Véges dimenziós szekvenciák strukturális vizsgálata.
In: Képfeldolgozók és alakfelismerők II. konferenciája, (KÉPAF 2) 2000, Noszvaj, Hungary, [Neumann János Számítógéptudományi Társaság], [Budapest], 29-32, 2000.

Fazekas, A., Hajdu, A., Hajdu, L.: Végtelen dimenziós szekvenciák strukturális vizsgálata.
In: Képfeldolgozók és alakfelismerők II. konferenciája, (KÉPAF 2) 2000, Noszvaj, Hungary, [Neumann János Számítógéptudományi Társaság], [Budapest], 33-36, 2000.

Hajdu, L., Pintér, Á.: Square product of three integers in short intervals.
Math. Comput. 68 (227), 1299-1301, 1999.

Hajdu, L., Herendi, T.: Explicit bounds for the solutions of elliptic equations with rational coefficients.
J. Symb. Comp. 25 (3), 361-366, 1998.

Hajdu, L.: On a diophantine equation concerning the number of integer points in special domains.
Acta Math. Hung. 78 (1-2), 59-70, 1998.

Bérczes, A., Brindza, B., Hajdu, L.: On the power values of polynomials.
Publ. Math. Debr. 53 (3-4), 375-381, 1998.

Bérczes, A., Hajdu, L.: Computational experiences on the distances of polynomials to irreducible polynomials.
Math. Comp. 66 (217), 391-398, 1997.

Hajdu, L.: On a Diophantine equation concerning the number of integer points in special domains II..
Publ. Math. Debr. 51 (3-4), 331-342, 1997.

Hajdu, L.: On a problem of Győry and Schinzel concerning polynomials.
Acta Arith. 78 (3), 287-295, 1997.