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 A085951 #7 Dec 15 2017 17:41:10 %S A085951 1,3,5,7,9,91,11,13,31,15,51,17,71,19,93,33,35,53,37,73,39,95,55,57, %T A085951 75,59,97,77,79,99,901,101,103,301,105,501,107,701,109,903,303,305, %U A085951 503,307,703,309,905,505,507,705,509,907,707,709,909,911,111,113,311,115,511 %N A085951 For n <= 5, a(n) = 2n-1. For n > 5, a(n) is the least odd number not already used that begins with the last digit of a(n-1). %Y A085951 Cf. A085952. %K A085951 easy,nonn,base %O A085951 1,2 %A A085951 _Amarnath Murthy_ and _Jason Earls_, Jul 15 2003 %E A085951 Corrected and extended by _David Wasserman_, Feb 15 2005 %E A085951 Edited by _Charles R Greathouse IV_, Aug 03 2010