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 A025680 #7 Jul 06 2025 12:45:18 %S A025680 0,0,1,0,1,2,0,1,2,3,0,1,2,3,4,0,1,2,3,4,0,5,1,2,3,4,0,5,1,6,2,3,4,0, %T A025680 5,1,6,2,7,3,4,0,5,1,6,2,7,3,8,4,0,5,1,6,2,7,3,8,4,0,9,5,1,6,2,7,3,8, %U A025680 4,0,9,5,1,10,6,2,7,3,8,4,0,9,5,1,10,6,2,11,7,3,8,4,0,9,5,1,10,6,2,11,7,3,12,8,4 %N A025680 Exponent of 9 (value of j) in n-th number of form 6^i*9^j. %Y A025680 Cf. A025628. %K A025680 nonn %O A025680 1,6 %A A025680 _David W. Wilson_