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 A174891 #8 Feb 06 2023 11:45:40 %S A174891 1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,32,33,34,35,36, %T A174891 38,39,40,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,64,65,68,69, %U A174891 72,74,75,76,77 %N A174891 Row indices for nonzero elements in first column of A174888. %C A174891 Compare with nonprimes A018252. 30 is not a member of this sequence. Neither is 42. %Y A174891 Cf. A174889, A174888, A018252. %K A174891 nonn %O A174891 1,2 %A A174891 _Mats Granvik_, Apr 01 2010