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 A218784 #10 Jul 16 2017 20:06:57 %S A218784 0,1,3,4,5,6,8,9,11,12,13,14,16,18,22,23,25,27,30,31,33,34,35,38,39, %T A218784 40,42,44,47,48,50,51,52,56,58,59,65,67,69,70,72,74,77,78,80,81,82,86, %U A218784 88,89,95,97,98,99,101,102,108,111,114,119,121,122,123,124,126,128 %N A218784 Positions where the parity of A179016 changes, i.e., where the runs of A213729 begin. %H A218784 Antti Karttunen, <a href="/A218784/b218784.txt">Table of n, a(n) for n = 0..8649</a> %F A218784 a(0)=0 and in the later terms i occurs whenever A213729(i) differs from A213729(i-1). %o A218784 (Scheme with _Antti Karttunen_'s intseq-library): (define A218784 (MATCHING-POS 0 0 (lambda (i) (or (< i 1) (not (= (A213729 i) (A213729 (-1+ i)))))))) %Y A218784 Cf. A213728, A213729, A218545, A218546, A218547. A218544(n)=a(n)+1. %K A218784 nonn %O A218784 0,3 %A A218784 _Antti Karttunen_, Nov 10 2012