A228919 - OEIS

A228919

Numbers n such that 1^(n+1) + 2^(n+1) + ... + n^(n+1) == 0 (mod n).

1, 4, 5, 7, 8, 11, 12, 13, 16, 17, 19, 20, 23, 24, 25, 28, 29, 31, 32, 36, 37, 40, 41, 43, 44, 47, 48, 49, 52, 53, 56, 59, 60, 61, 64, 65, 67, 68, 71, 72, 73, 76, 79, 80, 83, 84, 85, 88, 89, 91, 92, 96, 97, 100, 101, 103, 104, 107, 108, 109, 112, 113, 116

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

f[n_] := Mod[Sum[PowerMod[i, n + 1, n], {i, 1, n}], n]; Select[Range[1000], f[#] == 0 &]

PROG

(PARI) is(n)=my(m=n+1); sum(k=1, n, Mod(k, n)^m)==0 \\ Charles R Greathouse IV, Nov 20 2013

CROSSREFS

Cf. A191677, A121706.

Sequence in context: A159698 A288931 A191276 * A047377 A188265 A032714

Adjacent sequences: A228916 A228917 A228918 * A228920 A228921 A228922

KEYWORD

nonn

AUTHOR

José María Grau Ribas, Sep 08 2013

STATUS

approved