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 A182829 #6 Mar 30 2012 18:57:12 %S A182829 1,3,4,6,8,9,10,12,13,15,17,18,20,22,23,24,26,27,28,30,31,33,35,36,37, %T A182829 39,40,42,45,47,49,50,51,53,54,56,58,59,61,63,64,65,67,68,69,71,72,74, %U A182829 76,77,78,80,81,82,84,85,87,89,90,91,93,94,96,99 %N A182829 Positions of the numbers 3*i+1 in A026225; i.e., when all the numbers (3*i+1)*3^j are arranged in increasing order. %Y A182829 Cf. A026225, A181828. %K A182829 nonn %O A182829 1,2 %A A182829 _Clark Kimberling_, Dec 06 2010