A137641 a(n) = ((n+1)^(n^2) - 1)/n^3.

1, 10, 9709, 2384185791, 227442304239437611, 12276531693794691998976960100, 520133998799548061610162525309582775649689, 23027704253395670256876704807446325518902757016163752166205

Offset

1,2

Links

Table of n, a(n) for n=1..8.

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

Adjacent sequences: A137638 A137639 A137640 * A137642 A137643 A137644

Keyword

nonn

Author

Alexander Adamchuk, Jan 31 2008

Status

approved