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 A219638 #7 Nov 25 2012 23:47:09 %S A219638 3,6,10,11,15,18,19,23,26,30,31,32,36,39,43,44,48,51,52,53,57,60,64, %T A219638 65,69,72,73,77,80,84,85,86,87,91,94,98,99,103,106,107,111,114,118, %U A219638 119,120,124,127,131,132,136,139,140,141,142,146,149,153,154,158,161 %N A219638 Complement of A219640. Natural numbers that do not occur in A219641. %C A219638 These are positive integers i for which there does not exist any k such that A007895(i+k)=k. %H A219638 A. Karttunen, <a href="/A219638/b219638.txt">Table of n, a(n) for n = 1..10000</a> %o A219638 (Scheme with _Antti Karttunen_'s Intseq-library): %o A219638 (define A219638 (COMPLEMENT 1 A219640)) %Y A219638 A219640, A219641, A219648. Analogous sequence for binary system: A055938, for factorial number system: A219658. %K A219638 nonn %O A219638 1,1 %A A219638 _Antti Karttunen_, Nov 24 2012