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 A139418 #2 Mar 30 2012 17:27:55 %S A139418 2,6,7,8,11,12,13,14,17,18,19,20,21,27,28,29,30,31,32,33,34,35,38,39, %T A139418 40,41,42,43,44,45,46,47,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68, %U A139418 71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,94,95,96,97,98,99,100,101 %N A139418 Complement of A136120. %C A139418 k-th run of consecutive numbers has length A136120(k). %e A139418 A136120 starts 1, 3, 4, 5, 9, 10, 15, ..., so sequence starts 2, 6, 7, 8, 11, 12, ... . %Y A139418 Cf. A136120, A139419, A139420. %K A139418 easy,nonn %O A139418 1,1 %A A139418 _Klaus Brockhaus_, Apr 22 2008