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 A134453 #7 Mar 30 2012 18:50:59 %S A134453 5,15,17,23,41,43,45,47,51,53,59,69,71,77,95,121,123,125,127,129,131, %T A134453 133,135,137,141,143,149,151,153,155,159,161,167,177,179,185,203,205, %U A134453 207,209,213,215,221,231,233,239,257,283,285,287,293,311,337,355,361 %N A134453 Numbers m such that the digital root in balanced ternary representation equals -1. %C A134453 A134452(a(n)) = -1; union with A134454 gives the odd numbers (A005408). %H A134453 R. Zumkeller, <a href="/A134453/b134453.txt">Table of n, a(n) for n = 1..1000</a> %K A134453 nonn,base %O A134453 1,1 %A A134453 _Reinhard Zumkeller_, Oct 27 2007