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 A090974 #5 Mar 30 2012 19:00:14 %S A090974 0,1,5,12,31,69,181,443,1052,2701,6455,15928,40073,100362,251707, %T A090974 637235 %N A090974 Duplicate of A038606. %C A090974 With offset 1: Index j of prime p(j) such that ceiling[p(j)/j]=n is first satisfied for n >= 2. a(n) = A038606(n) = A062742(n) = A038624(n) for n >= 3. [From _Jaroslav Krizek_, Dec 13 2009] %K A090974 dead %O A090974 0,3