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 A099851 #8 Jan 31 2023 13:55:48 %S A099851 1,3,16,57,112,160,272,404,20924,147153,274617,4409708,24881389, %T A099851 34850872,39808233,186610952,980830465,1777956414 %N A099851 Numbers k such that A099850(k) is divisible by k. %e A099851 A099850(1)=0, which is divisible by 1. %e A099851 A099850(3)=3, which is divisible by 3. %e A099851 A099850(16)=48, which is divisible by 16. %Y A099851 Cf. A099850, A004648. %K A099851 more,nonn %O A099851 1,2 %A A099851 Mark Hudson (mrmarkhudson(AT)hotmail.com), Oct 27 2004 %E A099851 a(12)-a(18) from _Donovan Johnson_, Dec 14 2009