A176030 - OEIS

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A176030

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

1, 32, 59049, 4398046511104, 1490116119384765625, 808281277464764060643139600456536293376, 1798465042647412146620280340569649349251249 (list; graph; refs; listen; history; text; internal format)

	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`

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Last modified December 7 11:41 EST 2023. Contains 367656 sequences. (Running on oeis4.)