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 A104406 #9 Apr 29 2023 22:51:30 %S A104406 1,1,2,3,3,3,3,3,4,5,5,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,9,9,10,11,11, %T A104406 11,11,11,12,13,13,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, %U A104406 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15 %N A104406 Number of numbers <= n having no 2 in ternary representation. %C A104406 Partial sums of A039966: a(n) = Sum(A039966(k): 1<=k<=n). %H A104406 N. J. A. Sloane, <a href="/A104406/b104406.txt">Table of n, a(n) for n = 1..10000</a> %Y A104406 Cf. A005836, A004642, A039966. %Y A104406 This is a lower bound for A003002. %K A104406 nonn %O A104406 1,3 %A A104406 _Reinhard Zumkeller_, Mar 05 2005