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 A135983 #8 Mar 31 2012 10:22:06 %S A135983 127,2147483647,604462909807314587353087, %T A135983 10141204801825835211973625643007, %U A135983 170141183460469231731687303715884105727,2854495385411919762116571938898990272765493247 %N A135983 a(n)=2^A107006(n)-1. %C A135983 A107006(n) are successive primes of the form 24n+7. %t A135983 p = Select[24*Range[0, 20] + 7, PrimeQ]; 2^p - 1 %Y A135983 Cf. A107006, A124477, A135657, A135982. %K A135983 nonn %O A135983 1,1 %A A135983 _Artur Jasinski_, Dec 09 2007