A176030 - OEIS

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A176030

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

0

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

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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