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 A107623 #3 Mar 30 2012 17:26:16 %S A107623 5,5,8,9,14,15,20,21,26,31,34,39,44,45,50,55,62,63,70,73,76,81,86,91, %T A107623 100,103,106,109,112,115,130,133,140,141,152,153,160,165,170,175,182, %U A107623 183,194,195,200,201,214,225,230,231,236,241,244,253,260,265,272,273 %N A107623 Primes plus alternately 3 and 2. %F A107623 A107623(n) = prime(n) + (2 + mod(n, 2)). %t A107623 A107623[n_]:= Prime[n] + (2 + Mod[n, 2]) %Y A107623 Cf. A107620, A107621, 107622. %K A107623 easy,nonn %O A107623 1,1 %A A107623 _Zak Seidov_, May 18 2005