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 A056754 #5 Oct 09 2019 21:15:35
%S A056754 1,3,5,9,15,25,27,45,75,81,125,135,225,243,375,405,423,625,675,729,
%T A056754 765,801,895,1017,1125,1175,1215,1875,2025,2125,2187,3125,3375,3645,
%U A056754 4755,5625,6075,6561,9375,9585,10125,10935,15625,16875,17925,18225,19683
%N A056754 Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n + 1^n.
%t A056754 Do[ If[ Mod[ PowerMod[ 9, n, n ] + PowerMod[ 8, n, n ] + PowerMod[ 7, n, n ] + PowerMod[ 6, n, n ] + PowerMod[ 5, n, n ] + PowerMod[ 4, n, n ] + PowerMod[ 3, n, n ] + PowerMod[ 2, n, n ] + 1, n ] == 0, Print[ n ] ], {n, 1, 10^6} ]
%t A056754 Select[Range[20000],Divisible[Total[Range[2,9]^# ]+1,#]&] (* _Harvey P. Dale_, Oct 09 2019 *)
%Y A056754 Cf. A001556.
%K A056754 nonn
%O A056754 1,2
%A A056754 _Robert G. Wilson v_, Aug 25 2000