id:A057642 - OEIS Search Results

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Product(k^k) * sum(1/k^k) where both the sum and product are over those positive integers k that divide n.

+0
2

1, 5, 28, 1284, 3126, 6485292, 823544, 21541946368, 10847773719, 156290000012500, 285311670612, 14847746691430172786688, 302875106592254, 45756121633729931379676, 38327538543365478600000 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`The positive divisors of 4 are 1, 2, 4. So a(4) = 1^1 2^2 4^4 *(1/1^1 +1/2^2 +1/4^4) = 1284.`
	CROSSREFS	`Sequence in context: A023887 A057792 A024068 this_sequence A125137 A132550 A083020` `Adjacent sequences: A057639 A057640 A057641 this_sequence A057643 A057644 A057645`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet (qq-quet(AT)mindspring.com), Oct 11 2000`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research