This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A259683 #9 Jan 01 2021 04:27:48 %S A259683 17,41,13,1,1,1,11,23,1,7,1,113,1,53,97,1,313,1,11,353,1,193,1,1,1,7, %T A259683 1,1,31,1,1,13,33,43,29,31,7,1,1,1,241,1,1,7,1,433,127,89,1,1,197,1,1, %U A259683 17,1,29,1,85,53,33,29,1,1,577,15,1,1,79,1,1,1201,1,1241 %N A259683 Let m = A062695(n); a(n) is value of v in decomposition of m defined in Comments. %C A259683 Let m = A062695(n). Write m*y^2 = x^3 - x as m*square = A*B*(A-B)*(A+B) where A and B are the numerator and denominator of x. Then A, B, A-B, A+B have the form s*a^2, t*b^2, u*c^2, v*d^2 for some decomposition of m as s*t*u*v and some natural numbers a,b,c,d. These eight numbers are given in A259680-A259687. %H A259683 G. Kramarz, <a href="http://dx.doi.org/10.1007/BF01451411">All congruent numbers less than 2000</a>, Math. Annalen, 273 (1986), 337-340. %H A259683 G. Kramarz, <a href="/A003273/a003273.pdf">All congruent numbers less than 2000</a>, Math. Annalen, 273 (1986), 337-340. [Annotated, corrected, scanned copy] %Y A259683 Cf. A003273, A006991, A062695, A259680-A259687. %K A259683 nonn %O A259683 1,1 %A A259683 _N. J. A. Sloane_, Jul 04 2015 %E A259683 More terms from _Jinyuan Wang_, Jan 01 2021