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 A280504 #9 Jan 10 2017 19:14:13 %S A280504 1,1,1,2,1,3,1,4,1,1,11,1,13,7,1,8,1,9,19,10,1,11,13,6,25,13,1,7,11, %T A280504 15,1,16,1,15,13,2,37,1,11,12,41,1,25,22,1,13,47,4,11,25,1,1,19,3,55, %U A280504 1,13,11,59,5,61,31,1,32,1,33,67,34,69,35,61,36,1,37,13,38,59,39,25,40,81,41,11,42,1,43,87,44,55,45,91,46,1,47,19,24,97,49,1,25,13 %N A280504 a(n) = A280500(n,A280503(n)). %H A280504 Antti Karttunen, <a href="/A280504/b280504.txt">Table of n, a(n) for n = 1..8192</a> %H A280504 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %F A280504 a(n) = A280500(n,A280503(n)). %F A280504 Other identities. For all n >= 1: %F A280504 A048720(a(n), A280503(n)) = n. %o A280504 (Scheme) (define (A280504 n) (A280500bi n (A280503 n))) ;; Code for A280500bi given in A280500. %Y A280504 Cf. A048720, A056539, A280500, A280503, A280506. %Y A280504 Cf. A044918 (very likely gives the positions of all ones). %K A280504 nonn,base %O A280504 1,4 %A A280504 _Antti Karttunen_, Jan 09 2017