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 A126834 #23 Jan 06 2025 01:23:42 %S A126834 1,101,2,28,80,77,6,105,107,80,112,56,12,106,35,11,66,57,45,115,12,62, %T A126834 22,85,25,87,45,43,5,35,82,71,99,41,105,121,61,45,24,25,67,87,42,11, %U A126834 60,97,121,22,43,25,7,86,52,45,85,5,90,5,10,105,37,32,17,18,85,124,116,98,44 %N A126834 Ramanujan numbers (A000594) read mod 125. %H A126834 Seiichi Manyama, <a href="/A126834/b126834.txt">Table of n, a(n) for n = 1..10000</a> %H A126834 R. P. Bambah and S. Chowla, <a href="http://dx.doi.org/10.1090/S0002-9904-1947-08913-8">Congruence properties of Ramanujan’s function tau(n)</a>, Bull. Amer. Math. Soc. 53 (1947), 950-955. %H A126834 H. P. F. Swinnerton-Dyer, <a href="http://dx.doi.org/10.1007/978-3-540-37802-0_1">On l-adic representations and congruences for coefficients of modular forms</a>, pp. 1-55 of Modular Functions of One Variable III (Antwerp 1972), Lect. Notes Math., 350, 1973. %F A126834 a(n) = (5*n^2*sigma_7(n) - 4*n*sigma_2(n)) mod 125, for n coprime to 5. - _Michel Marcus_, Apr 26 2016 %t A126834 Mod[RamanujanTau@ #, 125] & /@ Range@ 69 (* _Michael De Vlieger_, Apr 26 2016 *) %o A126834 (PARI) a(n) = ramanujantau(n) % 125; \\ _Amiram Eldar_, Jan 05 2025 %Y A126834 Cf. A000594, A001157, A013955. %Y A126834 Cf. A126832 (mod 5^1), A126833 (mod 5^2), this sequence (mod 5^3), A126835 (mod 5^4). %K A126834 nonn %O A126834 1,2 %A A126834 _N. J. A. Sloane_, Feb 25 2007