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 A280771 #7 Jan 17 2017 19:43:29 %S A280771 2,3,5,6,8,9,12,13,15,16,18,19,21,22,25,26,29,30,32,33,37,38,40,41,45, %T A280771 46,50,51,53,54,56,57,60,61,64,65,67,68,71,72,75,76,78,79,81,82,84,85, %U A280771 88,89,92,93,96,97,99,100,102,103,105,106,109,110,112,113,116,117,122,123,126,127,129,130,133 %N A280771 Positions of even terms in A280864. %C A280771 By definition of A280864, this is a sequence of pairs of consecutive numbers, separated by gaps of size at least 1. %H A280771 N. J. A. Sloane, <a href="/A280771/b280771.txt">Table of n, a(n) for n = 1..10486</a> %Y A280771 Cf. A280864, A280770. %K A280771 nonn %O A280771 1,1 %A A280771 _N. J. A. Sloane_, Jan 17 2017