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 A138006 #18 Jul 12 2025 18:40:00 %S A138006 3,15,7,341,819,9709,2047,475107,31,3233097,5461,8388607,3556769739, %T A138006 31675383749,65498251203,575525617597,34359738367,549755813887, %U A138006 182518930210733,2047,37905296863701641,2251799813685247,963770320257286037,127,4833046947311902523261,82051117639860085587829,2814530423790308547362667 %N A138006 Length of all the nontrivial cycles of the Ducci map modulo 2 for the dimensions in A138004. %H A138006 Max Alekseyev, <a href="/A138006/b138006.txt">Table of n, a(n) for n = 1..292</a> %F A138006 a(n) = A038553(A138004(n)). - _Max Alekseyev_, Jul 10 2025 %Y A138006 Subsequence of A038553. %Y A138006 C.f. A135546, A138004. %K A138006 nonn %O A138006 1,1 %A A138006 _T. D. Noe_, Feb 26 2008 %E A138006 Edited and terms a(23) onward added by _Max Alekseyev_, Jul 10 2025