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 A100108 #5 Jan 21 2019 19:01:55 %S A100108 11,312211,13112221 %N A100108 Primes in A005150. %Y A100108 Cf. A005150. %K A100108 nonn,more,bref,base %O A100108 1,1 %A A100108 _Jorge Coveiro_, Dec 26 2004 %E A100108 When further terms have been found, we may add the sequence "Numbers n such that A005150(n) is prime". It begins 2, 6, 7.