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 A101761 #8 Aug 02 2021 02:30:41 %S A101761 3,4,5,7,21,35,97,830,947,2627 %N A101761 Iccanobif prime indices: Indices of prime numbers in A014259. %C A101761 No more terms through 10^4. %Y A101761 Cf. A000040, A001129, A014258-A014260, A101759-A101762. %K A101761 nonn,base,more %O A101761 1,1 %A A101761 _Jonathan Vos Post_ and _Ray Chandler_, Dec 15 2004