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 A025645 #7 Jul 06 2025 12:52:32 %S A025645 0,0,1,0,1,2,0,1,2,3,0,1,2,3,0,4,1,2,3,0,4,1,5,2,3,0,4,1,5,2,6,3,0,4, %T A025645 1,5,2,6,3,7,0,4,1,5,2,6,3,7,0,4,8,1,5,2,6,3,7,0,4,8,1,5,9,2,6,3,7,0, %U A025645 4,8,1,5,9,2,6,10,3,7,0,4,8,1,5,9,2,6,10,3,7,11,0,4,8,1,5,9,2,6,10,3,7,11,0,4,8 %N A025645 Exponent of 4 (value of j) in n-th number of form 3^i*4^j. %Y A025645 Cf. A025613. %K A025645 nonn %O A025645 1,6 %A A025645 _David W. Wilson_