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 A218405 #21 May 13 2023 17:39:19 %S A218405 4,47616,293760,1782144,3485664,134209536,282977280,746444160, %T A218405 1459956960,1684126080,1716728832,27298252800,41233360896, %U A218405 376591138560,719045268480,1622308746240,38965526046720,41769966551040,985261739212800,3067660098994176 %N A218405 Numbers k for which sigma(k)/k - 3/4 is an integer. %C A218405 a(14) > 10^11. - _Donovan Johnson_, Oct 31 2012 %C A218405 a(16) > 10^12. - _Giovanni Resta_, Nov 04 2012 %Y A218405 Cf. A218404, A159907. %K A218405 nonn %O A218405 1,1 %A A218405 _Zdenek Cervenka_, Oct 28 2012 %E A218405 a(6)-a(13) from _Donovan Johnson_, Oct 31 2012 %E A218405 a(14)-a(15) from _Giovanni Resta_, Nov 04 2012 %E A218405 More terms from _Michel Marcus_, Jun 26 2013