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 A025681 #7 Jul 06 2025 14:13:47 %S A025681 0,0,1,0,1,2,0,1,2,3,0,1,2,3,4,0,1,2,3,4,5,0,1,2,3,4,5,6,0,1,2,3,4,5, %T A025681 6,7,0,1,2,3,4,5,6,7,0,8,1,2,3,4,5,6,7,0,8,1,9,2,3,4,5,6,7,0,8,1,9,2, %U A025681 10,3,4,5,6,7,0,8,1,9,2,10,3,11,4,5,6,7,0,8,1,9,2,10,3,11,4,12,5,6,7,0,8,1,9,2 %N A025681 Exponent of 9 (value of j) in n-th number of form 7^i*9^j. %Y A025681 Cf. A025631. %K A025681 nonn %O A025681 1,6 %A A025681 _David W. Wilson_