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 A240676 #21 May 12 2014 22:08:10 %S A240676 1,1,3,4,5,5,6,6,7,7,8,8,8,8,9,9,9,9,9,9,10,10,10,10,10,10,10,11,11, %T A240676 11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12, %U A240676 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13 %N A240676 Number of digits in the decimal expansion of n^7. %F A240676 a(n) = A055642(n^7) = A055642(A001015(n)). %e A240676 a(1) = 1, because 1^7 = 1. %e A240676 a(2) = 4, because 2^7 = 1024. %o A240676 (PARI) a(n)=max(#digits(n^7),1) \\ _Charles R Greathouse IV_, May 12 2014 %K A240676 nonn,base,easy %O A240676 0,3 %A A240676 _Michelle Tu_, Apr 28 2014