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 A171993 #6 Mar 30 2012 18:52:38 %S A171993 1,4,8,10,14,16,20,22,25,26,28,32,34,35,38,40,44,46,49,50,52,55,56,58, %T A171993 62,64,65,68,70,74,76,77,80,82,85,86,88,91,92,94,95,98,100,104,106, %U A171993 110,112,115,116,118,119,121,122,124,125,128,130,133,134,136,140,142,143 %N A171993 Numbers that are neither prime nor multiples of 3. %C A171993 1 together with composite numbers that are not multiples of 3. %F A171993 a(n) = A157695(n-1), n>1. [From _R. J. Mathar_, Feb 07 2010] %F A171993 a(n) ~ 1.5n. %Y A171993 Cf. A018252, A157695. %K A171993 nonn,less %O A171993 1,2 %A A171993 _Juri-Stepan Gerasimov_, Jan 21 2010 %E A171993 Edited by _Charles R Greathouse IV_, Mar 19 2010