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 A033839 #13 Dec 11 2021 04:35:08 %S A033839 2,10,9,0,65,35411,37271,72865,2236488,1110699,416002778,0,5021821389, %T A033839 0,533453816220,0,18487285640920,0,1314916195476894,0, %U A033839 66773332795109537,138809539743164589,1591663132485308115,14216271609499243850 %N A033839 Smallest number > 1 equal to sum of n-th powers of its base-7 digits, or 0 if no such number exists (written in base 10). %H A033839 Joseph Myers, <a href="/A033839/b033839.txt">Table of n, a(n) for n=1..215</a> %Y A033839 Cf. A162228, A162229, A162230. In other bases: A033835 (base 3), A033836 (base 4), A033837 (base 5), A033838 (base 6), A033840 (base 8), A033841 (base 9), A003321 (base 10). - _Joseph Myers_, Jul 07 2009 %K A033839 nonn,base %O A033839 1,1 %A A033839 _David W. Wilson_ %E A033839 Extended by _Joseph Myers_, Jul 07 2009