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 A086878 #17 Mar 12 2018 19:16:33 %S A086878 191,701,743,1111,1389,1479,2103,2215,2375,2681,2951,4281,4423,4491, %T A086878 4743,5337,5517,5895,6319,6367,6491,6703,6751,7247,7319,7463,7481, %U A086878 7571,7751,7909,7993,8043,8083,8269,8425,8537,8839,8853,8971,9479,10481 %N A086878 Numbers n such that A003313(n) = A003313(2n). %H A086878 Hugo Pfoertner, <a href="/A086878/b086878.txt">Table of n, a(n) for n = 1..10000</a> %H A086878 E. G. Thurber, <a href="http://dx.doi.org/10.1016/0012-365X(76)90105-9">Addition chains and solutions of l(2n)=l(n) and l(2^n-1)=n+l(n)-1</a>, Discrete Math., Vol. 16 (1976), 279-289. %Y A086878 Cf. A003313, A230528. %K A086878 nonn %O A086878 1,1 %A A086878 _Pontus von Brömssen_, Sep 16 2003