A176030 a(n) = n^(sigma_2(n)).

1, 32, 59049, 4398046511104, 1490116119384765625, 808281277464764060643139600456536293376, 1798465042647412146620280340569649349251249

Offset

1,2

Comments

sigma_2 = A001157 is the sum of squares of divisors of n.

Links

Table of n, a(n) for n=1..7.

Formula

a(n) = n^A001157(n).

Example

a(1) = 1^1 = 1.
a(2) = 2^(1+4) = 32.
a(3) = 3^(1+9) = 59049.

Mathematica

Table[n^DivisorSigma[2, n], {n, 20}]

Crossrefs

Cf. A001157, A100879.

Sequence in context: A054374 A221138 A017009 * A034245 A230566 A017093

Adjacent sequences: A176027 A176028 A176029 * A176031 A176032 A176033

Keyword

nonn,easy

Author

Michel Lagneau, Apr 06 2010

Status

approved