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 A137951 #10 Feb 16 2025 08:33:07 %S A137951 0,1,3,4,6,10,12,13,15,19,21,31,33,37,39,40,42,46,48,58,60,64,66,94, %T A137951 96,100,102,112,114,118,120,121,123,127,129,139,141,145,147,175,177, %U A137951 181,183,193,195,199,201,283,285,289,291,301,303,307,309,337,339,343,345 %N A137951 Redundant binary representation (A089591) of n interpreted as ternary number. %C A137951 A007089(a(n)) = A089591(n). %H A137951 R. Zumkeller, <a href="/A137951/b137951.txt">Table of n, a(n) for n = 0..10000</a> %H A137951 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Ternary.html">Ternary</a> %e A137951 A089591(10)=210 --> a(10)=2*3^2+1*3^1+0*3^0=18+3+0=21; %e A137951 A089591(11)=1011 --> a(11)=1*3^3+0*3^2+1*3^1+1*3^0=27+0+3+1=31. %K A137951 nonn,base %O A137951 0,3 %A A137951 _Reinhard Zumkeller_, Feb 25 2008