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 A088140 #10 Nov 22 2022 05:07:11 %S A088140 2,1,4,1,6,1,8,9,10,1,12,1,14,15,16,1,18,1,20,21,22,1,24,25,26,27,28, %T A088140 1,30,1,32,33,34,35,36,1,38,39,40,1,42,1,44,45,46,1,48,49,50,51,52,1, %U A088140 54,55,56,57,58,1,60,1,62,63,64,65,66,1,68,69,70,1,72,1,74,75,76,77,78,1 %N A088140 Duplicate of A005451 (for n >= 3). %C A088140 Previous name was: a(n) = 1 if n is an odd prime otherwise a(n) = n. %K A088140 dead %O A088140 2,1 %A A088140 _Roger L. Bagula_, Nov 04 2003