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On a Family of Congruent Numbers Defined Modulo 72: A Conjectural Study

Received: 14 September 2025     Accepted: 18 October 2025     Published: 22 October 2025
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Abstract

We investigate the interplay between the Chinese Remainder Theorem and the theory of congruent numbers through a modular approach to expressing integers as sums of three cubes. By analyzing congruence systems arising from specific residue classes modulo 8 and modulo 9, we classify the possible integers likely to be representable as sums of cubes based on their modular residues. We also explore computational methods applying this modular framework to identify explicit cube decompositions within these classes.

Published in Pure and Applied Mathematics Journal (Volume 14, Issue 5)
DOI 10.11648/j.pamj.20251405.16
Page(s) 157-160
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Congruent Numbers, Chinese Remainder Theorem, Modular Arithmetic, Sums of Cubes, Diophantine Equations

References
[1] H. R. Abdolmalki and F. Izadi, New methods for obtaining new families of congruent numbers, Notes on Number Theory and Discrete Mathematics, 25(1), 14-24, 2019.
[2] W. Hürlimann, Bell’s Ternary Quadratic Forms and Tunnel’s Congruent Number Criterion Revisited, Advances in Pure Mathematics, 5, 267-277, 2015.
[3] W. Hürlimann, A Congruent Twin Number Problem, Pioneer Journal of Algebra, Number Theory and its Applications, 1(1), 53-66, 2011.
[4] J. A. Johnstone and B. K. Spearman, On the distribution of congruent numbers, Proceedings of the Japan Academy, Series A, 2010.
[5] J. H. Silverman and J. Tate, Rational Points on Elliptic Curves, 2nd edition, Springer, The Arithmetic of Elliptic Curves. Graduate Texts in Math, 2009.
[6] H. Cohen, Number Theory, Volume I: Tools and Diophantine Equations, Graduate Texts in Mathematics, Springer Science + Business Media, LLC, New York, 2007.
[7] S. K. Chahal, Infinitely many congruent numbers in each congruence class modulo 8, Journal of Number Theory, 2000.
[8] K. Feng, Non-congruent numbers, odd graphs and the Birch-Swinnerton-Dyer conjecture, Acta Arithmetica, 75(1), 71-83, 1996.
[9] L. Pisani, Liber Quadratorum, 1225, translation and commentary by L. E. Sigler, Springer, 1987.
[10] N. Koblitz, Introduction to Elliptic Curves and Modular Forms, Springer, New York, 1984.
[11] J. Tunnel, A Classical Diophantine Problem and Modular Forms of Weight 3/2, Inventiones Mathematicae, 72, 323-334, 1983.
[12] J. Lagrange, Construction d’une table de nombres congruents, Mémoires de la S. M. F., tome 49-50, 125-130, 1977.
[13] R. Alter, T. B. Curtz, and K. K. Kubota, Remarks and Results on Congruent Numbers, Proceedings of the 3rd Southeastern Conference on Combinatorics, Graph Theory and Computing, Boca Raton, 28 February-2 March 1972, 27-35.
[14] J. B. Birch and H. P. F. Swinnerton-Dyer, Notes on Elliptic Curves II, Journal für die Reine und Angewandte Mathematik (Crelle’s Journal), 218, 79-108, 1965.
[15] J. B. Birch and H. P. F. Swinnerton-Dyer, Notes on Elliptic Curves I, Journal für die Reine und Angewandte Mathematik (Crelle’s Journal), 212, 7-25, 1963.
[16] P. Fermat, Œuvres de Fermat, T. I-IV, Gauthier-Villars, 1891-1922.
[17] Diophantus, Arithmetica, édition de X. R. Charlier, 1893.
Cite This Article
  • APA Style

    Vincent, K. K. (2025). On a Family of Congruent Numbers Defined Modulo 72: A Conjectural Study. Pure and Applied Mathematics Journal, 14(5), 157-160. https://doi.org/10.11648/j.pamj.20251405.16

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    ACS Style

    Vincent, K. K. On a Family of Congruent Numbers Defined Modulo 72: A Conjectural Study. Pure Appl. Math. J. 2025, 14(5), 157-160. doi: 10.11648/j.pamj.20251405.16

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    AMA Style

    Vincent KK. On a Family of Congruent Numbers Defined Modulo 72: A Conjectural Study. Pure Appl Math J. 2025;14(5):157-160. doi: 10.11648/j.pamj.20251405.16

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      author = {Kouakou Kouassi Vincent},
      title = {On a Family of Congruent Numbers Defined Modulo 72: A Conjectural Study
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      abstract = {We investigate the interplay between the Chinese Remainder Theorem and the theory of congruent numbers through a modular approach to expressing integers as sums of three cubes. By analyzing congruence systems arising from specific residue classes modulo 8 and modulo 9, we classify the possible integers likely to be representable as sums of cubes based on their modular residues. We also explore computational methods applying this modular framework to identify explicit cube decompositions within these classes.
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Author Information
  • Applied Fundamental Sciences Department, Nangui Abrogoua University, Abidjan, Côte d’Ivoire

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