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A137641
a(n) = ((n+1)^(n^2) - 1)/n^3.
2
1, 10, 9709, 2384185791, 227442304239437611, 12276531693794691998976960100, 520133998799548061610162525309582775649689, 23027704253395670256876704807446325518902757016163752166205
OFFSET
1,2
FORMULA
a(n) = ((n+1)^(n^2) - 1)/n^3.
MATHEMATICA
Table[ ((n + 1)^(n^2) - 1)/n^3, {n, 1, 10} ]
CROSSREFS
Cf. A137642 (((p+1)^(p^2) - 1)/p^3 for p = prime(n)).
Cf. A133591 (((p-1)^(p^2) + 1)/p^3 for p = prime(n)).
Sequence in context: A109893 A208781 A125544 * A137642 A163019 A013746
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Jan 31 2008
STATUS
approved