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 A255060 #9 Feb 17 2015 00:10:48 %S A255060 1,4,7,8,9,12,13,16,17,18,21,22,27,28,29,32,33,34,37,38,43,45,46,47, %T A255060 49,50,51,56,57,58,61,62,63,66,67,72,74,75,76,78,80,82,84,85,86,87,89, %U A255060 90,91,96,98,99,100,102,103,104,109,110,111,114,115,116,119,120,125,127,128,129,131,133,135,137,138,139,140,142,144 %N A255060 Positions n where A255054(n) is even. %H A255060 Antti Karttunen, <a href="/A255060/b255060.txt">Table of n, a(n) for n = 1..10000</a> %o A255060 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A255060 (define A255060 (MATCHING-POS 1 0 (lambda (n) (even? (A255054 n))))) %Y A255060 Complement: A255059. %Y A255060 Cf. A255054. %K A255060 nonn %O A255060 1,2 %A A255060 _Antti Karttunen_, Feb 16 2015