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 A247156 #43 Feb 16 2025 08:33:23 %S A247156 8980616927734375,3503434660075044981,172399434201593354756, %T A247156 286243267692724486144,640558364167263622626,691170144025469730622, %U A247156 1480279477146615234375,1768130802583126953125,4567199176912486400000,42940402913709544921875,70660346341309333984375,149614794149226010902528,161649111002260792968750,191259085113459945312500,260799524107083767968750,597787522207315571077947,626877403613887304040448,689763222744895005949242,689766726179555080994223,5514132424881463208443904,7567151576542452425781250,9592298143650890255171584,136574874874360806036041889 %N A247156 Numbers that are repeated in A001379. %C A247156 Apart of the single numbers, A001379 contains two copies of every term of this sequence, except of a(20) = 5514132424881463208443904 which A001379 contains three copies. %H A247156 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MonstrousMoonshine.html">Monstrous Moonshine</a> %Y A247156 Cf. A001379, A244431. %K A247156 nonn,fini,full %O A247156 1,1 %A A247156 _Omar E. Pol_, Nov 28 2014