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 A102690 #12 Dec 29 2018 07:51:05 %S A102690 10,6,5,4,3,3,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1 %N A102690 Number of n-expodigital numbers (i.e., numbers m such that m^n has exactly n decimal digits). %C A102690 a(n) = 10 - A102691(n). %e A102690 a(6) = 3 because only the 3 numbers 7, 8 and 9 are 6-expodigital: 7^6 = 117649, 8^6 = 262144, 9^6 = 531441. %Y A102690 Cf. A102691. %Y A102690 Main diagonal of A216653. %K A102690 fini,full,nonn,base %O A102690 1,1 %A A102690 _Lekraj Beedassy_, Jan 21 2005 %E A102690 Edited by _Charles R Greathouse IV_, Aug 03 2010