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 A088155 #5 Feb 16 2025 08:32:51 %S A088155 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,8,10,6,14,15,8,2,0,0,13,11,5,8,6, %T A088155 0,12,6,0,12,1,11,2,4,11,11,3,15,8,4,10,1,14,1,14,0,6,0,5,14,12,9,9,1, %U A088155 4,2,1,0,10,7,15,4,10,15,3,13,1,12,7,15,14,4,7,1,14,8,5,8,4,9,9,13,6 %N A088155 Value of n-th digit in hexadecimal representation of n^n. %C A088155 a(n)=d(n) with n^n = Sum(d(k)*16^k: 0<=d(k)<16, k>=0). %H A088155 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Hexadecimal.html">Hexadecimal</a> %F A088155 a(n) = floor(n^n / 16^n) mod 16. %e A088155 n=20, 20^20=1048576*10^20 -> [56BC75E2D6310000000000], a(20)=6. %e A088155 a(0)=1, a(k)=0 for 0<k<16 and a(16)=1. %Y A088155 Cf. A000312, A088150, A088151, A088152, A088153, A088154, A088156, A088157. %K A088155 nonn,base %O A088155 0,18 %A A088155 _Reinhard Zumkeller_, Sep 20 2003