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 A280002 #38 Feb 23 2017 22:32:30 %S A280002 1,5,10,23,30,267 %N A280002 Integers n such that A157752 (n) are primes. %C A280002 For n=9,13,17,18,20,22,41,..., A157752(n) is a semiprime (Cf. A280001). %Y A280002 Cf. A157752, A280001. %K A280002 nonn %O A280002 1,2 %A A280002 _Zak Seidov_, Feb 21 2017