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 A145743 #3 Mar 30 2012 17:37:44 %S A145743 9,15,25,25,247,583,5377,143473,143473,143473,2821813,62087033647, %T A145743 91450844347 %N A145743 a(n) is the smallest composite number m such that all n numbers m+4*k^2 for k=1,2,...,n are prime. %C A145743 There is no further term up to 5*10^8. %Y A145743 Cf. A145741, A145742. %K A145743 more,nonn %O A145743 1,1 %A A145743 _Farideh Firoozbakht_, Oct 17 2008 %E A145743 a(12)-a(13) from _Donovan Johnson_, Nov 17 2008