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 A033840 #13 Dec 11 2021 04:35:15 %S A033840 2,20,92,16,1056,212419,128,13379,40695508,1024,4196352,13892162580, %T A033840 8192,268451840,1002493281672,65536,17180000256,4998382669357032, %U A033840 524288,1099512676352,3418993385062038719,4194304,70368752566272 %N A033840 Smallest number > 1 equal to sum of n-th powers of its base-8 digits, or 0 if no such number exists (written in base 10). %H A033840 Joseph Myers, <a href="/A033840/b033840.txt">Table of n, a(n) for n=1..170</a> %Y A033840 Cf. A162231, A162232, A162233. In other bases: A033835 (base 3), A033836 (base 4), A033837 (base 5), A033838 (base 6), A033839 (base 7), A033841 (base 9), A003321 (base 10). - _Joseph Myers_, Jul 07 2009 %K A033840 nonn,base %O A033840 1,1 %A A033840 _David W. Wilson_ %E A033840 Extended by _Joseph Myers_, Jul 07 2009