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 A126829 #11 Jan 05 2025 12:04:09 %S A126829 1,219,9,229,213,27,23,159,81,234,12,117,116,177,216,70,126,0,38,177, %T A126829 207,198,69,216,223,132,0,164,84,162,98,9,108,135,39,81,236,60,72,90, %U A126829 87,135,203,75,0,45,75,144,21,237,162,77,135,0,126,12,99,171,24,135,50,78,162 %N A126829 Ramanujan numbers (A000594) read mod 243. %D A126829 Oddmund Kolberg, Congruences for Ramanujan's Function ̈tau(n), Univ. Bergen Årbok Naturvit Rekke, No. 11, 1962. %H A126829 Amiram Eldar, <a href="/A126829/b126829.txt">Table of n, a(n) for n = 1..10000</a> %H A126829 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 A126829 a(n) == sigma_11(n) (mod 243) for n == 1 (mod 3) (Kolberg, 1962). - _Amiram Eldar_, Jan 05 2025 %t A126829 a[n_] := Mod[RamanujanTau[n], 243]; Array[a, 100] (* _Amiram Eldar_, Jan 05 2025 *) %o A126829 (PARI) a(n) = ramanujantau(n) % 243; \\ _Amiram Eldar_, Jan 05 2025 %Y A126829 Cf. A000594, A013959. %K A126829 nonn %O A126829 1,2 %A A126829 _N. J. A. Sloane_, Feb 25 2007