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 A102828 #4 Oct 06 2013 23:36:38 %S A102828 1,3,7,13,19,25,31,41,47,57,65,69,75,83,91,101,109,119,131,137,143, %T A102828 153,161,167,177,185,195,203,213,223,237,249,261,267,275,283,293,301, %U A102828 311,323,331,341,351,365,377,389,397,407,419,429,441,453,463,477,491 %N A102828 "True already", base 2, start 1: a(n) is the least integer such that the sequence up to a(n-1) written in base 2 contains floor(a(n)/2) copies of the digit a(n) % 2, with a(0) = 1. %D A102828 Inspired by discussion of "True so far" from _Eric Angelini_ (A102357). %Y A102828 Cf. A102823-A102830, A102357. %K A102828 nonn,easy,base %O A102828 0,2 %A A102828 _Hugo van der Sanden_, Feb 26 2005