id:A050214 - OEIS Search Results

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Product((d+n/d): d divides n and d^2<=n); a(1)=1.

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1, 3, 4, 20, 6, 35, 8, 54, 60, 77, 12, 728, 14, 135, 128, 1360, 18, 1881, 20, 2268, 220, 299, 24, 3, 8500, 260, 405, 336, 5104, 30, 75361, 32, 7128, 476, 665, 432, 1731600, 38, 819, 640, 164164, 42, 21856, 9, 44, 16200, 11592, 1175, 48, 5422144, 700, 20655 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)=n+1 iff n is prime.`
	EXAMPLE	`a(12)=(1+12)(2+6)(3+4)=1387=728.`
	CROSSREFS	`Adjacent sequences: A050211 A050212 A050213 this_sequence A050215 A050216 A050217` `Sequence in context: A025089 A041989 A041561 this_sequence A051719 A047165 A124631`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 08 2003`

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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