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 A025678 #7 Jul 06 2025 13:26:00 %S A025678 0,0,0,0,1,0,1,0,1,0,1,2,0,1,2,0,1,2,0,1,2,3,0,1,2,3,0,1,2,3,0,1,2,3, %T A025678 4,0,1,2,3,4,0,1,2,3,4,0,1,2,3,4,5,0,1,2,3,4,5,0,1,2,3,4,5,0,1,2,3,4, %U A025678 5,0,6,1,2,3,4,5,0,6,1,2,3,4,5,0,6,1,2,3,4,5,0,6,1,7,2,3,4,5,0,6,1,7,2,3,4,5,0,6 %N A025678 Exponent of 9 (value of j) in n-th number of form 2^i*9^j. %Y A025678 Cf. A025611. %K A025678 nonn %O A025678 1,12 %A A025678 _David W. Wilson_