id:A068342 - OEIS Search Results

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a(1) = 1; a(n+1) = (product{k|n} a(k)) (sum{j|n} 1/a(j)), where both the product and sum are over the positive divisors of n.

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1, 1, 2, 3, 7, 8, 42, 43, 304, 914, 13717, 13718, 1948004, 1948005, 165580467, 3808350755, 1157738629649, 1157738629650, 14800530641450464, 14800530641450465, 703750431470328179479, 90080055228202006973396 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`a(7) = a(1) a(2) a(3) a(6) (1/a(1) + 1/a(2) + 1/a(3) + 1/a(6)) = 1 1 2 8 (1 + 1 + 1/2 + 1/8) = 42.`
	CROSSREFS	`Sequence in context: A056432 A056433 A064669 this_sequence A038034 A103173 A098863` `Adjacent sequences: A068339 A068340 A068341 this_sequence A068343 A068344 A068345`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Feb 27 2002`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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