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 A164881 #5 Jun 02 2025 01:53:21 %S A164881 1,10,1,100,9,1,1000,91,8,1,10000,909,83,7,1,100000,9091,826,76,6,1, %T A164881 1000000,90909,8265,750,70,5,1,10000000,909091,82644,7515,680,65,4,1 %N A164881 Inverse of A164844. %e A164881 1 %e A164881 10,1 %e A164881 100,9,1 %e A164881 1000,91,8,1 %e A164881 10000,909,83,7,1 %e A164881 100000,9091,826,76,6,1 %e A164881 1000000,90909,8265,750,70,5,1 %e A164881 10000000,909091,82644,7515,680,65,4,1 %Y A164881 A164844 %K A164881 nonn,tabl %O A164881 1,2 %A A164881 _Mark Dols_, Aug 29 2009