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 A126846 #9 Jan 05 2025 01:11:05 %S A126846 1,505,252,115,69,300,184,369,92,460,322,414,459,345,460,22,161,437, %T A126846 483,0,345,207,254,413,162,93,116,0,344,69,229,230,207,368,0,0,207,46, %U A126846 346,69,160,184,138,0,0,252,459,254,139,344,368,414,253,390,0,184,46,208,71,0 %N A126846 Ramanujan numbers (A000594) read mod 23^2. %H A126846 Amiram Eldar, <a href="/A126846/b126846.txt">Table of n, a(n) for n = 1..10000</a> %H A126846 Jean-Pierre Serre, <a href="http://www.numdam.org/item/?id=SDPP_1967-1968__9_1_A13_0">Une interprétation des congruences relatives à la fonction tau de Ramanujan</a>, Séminaire Delange-Pisot-Poitou, Théorie des nombres, Vol. 9, No. 1 (1967-1968), Talk no. 14, 17 p., section 4.5, page 14-11. %H A126846 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 A126846 a(p) == sigma_11(p) (mod 23^2) for prime p of the form u^2 + 23*v^2, u >= 1 (Serre, 1968). - _Amiram Eldar_, Jan 05 2025 %t A126846 a[n_] := Mod[RamanujanTau[n], 529]; Array[a, 100] (* _Amiram Eldar_, Jan 05 2025 *) %o A126846 (PARI) a(n) = ramanujantau(n) % 529; \\ _Amiram Eldar_, Jan 05 2025 %Y A126846 Cf. A000594, A013959. %K A126846 nonn %O A126846 1,2 %A A126846 _N. J. A. Sloane_, Feb 25 2007