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 A285221 #8 Nov 19 2017 17:21:45 %S A285221 1,2,660,1564,1610,9690,39102 %N A285221 Indices of primes in A022567. %C A285221 No other terms below 250000. %e A285221 660 is in the sequence because A022567(660) = 50982304291263233250716951 is prime. %Y A285221 Cf. A022567, A035359. %K A285221 nonn,more %O A285221 1,2 %A A285221 _Vaclav Kotesovec_, Apr 14 2017