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%I #17 Feb 15 2023 13:51:36
%S 0,1,2,0,0,3,0,0,6,5,0,0,0,7,7,0,0,9,0,0,14,11,0,0,0,13,18,0,0,15,0,0,
%T 22,17,23,0,0,19,26,0,0,21,0,0,30,23,0,0,0,25,34,0,0,27,44,0,38,29,0,
%U 0,0,31,42,0,0,33,0,0,46,35,0,0,0,37,35,0,66
%N Sum(m^(n+1), m=1...n-1) modulo n.
%H Antti Karttunen, <a href="/A228926/b228926.txt">Table of n, a(n) for n = 1..16384</a>
%F a(n) = A121706(n) mod (n-1). - _T. D. Noe_, Sep 16 2013
%t f[n_] := Mod[Sum[PowerMod[i,n+1,n], {i, 1, n}], n]; Table[f[n], {n, 100}]
%o (PARI) a(n)=lift(sum(m=1,n-1,Mod(m,n)^(n+1))) \\ _Charles R Greathouse IV_, Dec 27 2013
%Y Cf. A121706, A228919, A204187.
%K nonn
%O 1,3
%A _José María Grau Ribas_, Sep 08 2013
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