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 A025679 #7 Jul 06 2025 14:00:01 %S A025679 0,0,1,0,1,2,0,1,2,0,3,1,2,0,3,1,4,2,0,3,1,4,2,5,0,3,1,4,2,5,0,3,6,1, %T A025679 4,2,5,0,3,6,1,4,7,2,5,0,3,6,1,4,7,2,5,8,0,3,6,1,4,7,2,5,8,0,3,6,9,1, %U A025679 4,7,2,5,8,0,3,6,9,1,4,7,10,2,5,8,0,3,6,9,1,4,7,10,2,5,8,0,11,3,6,9,1,4,7,10,2,5 %N A025679 Exponent of 9 (value of j) in n-th number of form 5^i*9^j. %Y A025679 Cf. A025624. %K A025679 nonn %O A025679 1,6 %A A025679 _David W. Wilson_