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 A134454 #7 Mar 30 2012 18:50:59 %S A134454 1,3,7,9,11,13,19,21,25,27,29,31,33,35,37,39,49,55,57,61,63,65,67,73, %T A134454 75,79,81,83,85,87,89,91,93,97,99,101,103,105,107,109,111,113,115,117, %U A134454 119,139,145,147,157,163,165,169,171,173,175,181,183,187,189,191,193,195 %N A134454 Numbers m such that the digital root in balanced ternary representation equals +1. %C A134454 A134452(a(n)) = 1; union with A134453 gives the odd numbers (A005408). %H A134454 R. Zumkeller, <a href="/A134454/b134454.txt">Table of n, a(n) for n = 1..1000</a> %K A134454 nonn,base %O A134454 1,2 %A A134454 _Reinhard Zumkeller_, Oct 27 2007