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 A285218 #8 Nov 19 2017 17:19:12 %S A285218 4,5,6,7,8,12,21,25,28,32,34,36,44,51,58,68,71,73,76,84,85,105,117, %T A285218 131,132,148,150,160,162,163,170,172,188,190,216,226,233,249,252,253, %U A285218 264,273,284,307,338,356,358,372,378,383,390,424,435,449,456,468,479 %N A285218 Indices of primes in A001156. %H A285218 Vaclav Kotesovec, <a href="/A285218/b285218.txt">Table of n, a(n) for n = 1..2119</a> %e A285218 51 is in the sequence because A001156(51) = 107 is prime. %Y A285218 Cf. A001156, A046063. %K A285218 nonn %O A285218 1,1 %A A285218 _Vaclav Kotesovec_, Apr 14 2017