id:A053626 - OEIS Search Results

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a(n) = smallest integer k such that harmonic mean of n and k is an integer.

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1, 2, 3, 4, 5, 2, 7, 8, 9, 10, 11, 4, 13, 14, 3, 16, 17, 6, 19, 5, 21, 22, 23, 8, 25, 26, 27, 4, 29, 6, 31, 32, 33, 34, 14, 12, 37, 38, 39, 10, 41, 7, 43, 44, 5, 46, 47, 16, 49, 50, 51, 52, 53, 18, 55, 8, 57, 58, 59, 12, 61, 62, 18, 64, 65, 6, 67, 68, 69, 28, 71, 9, 73, 74, 15, 76 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`If a(n)<>n then n is in A005279`
	EXAMPLE	`a(6)=2 because harmonic mean of 6 and 2 is 3 which is an integer and harmonic mean of 6 and 1 is 12/7 which is not an integer`
	CROSSREFS	`Cf. A005279.` `Sequence in context: A066296 A162961 A145255 this_sequence A134364 A104413 A127064` `Adjacent sequences: A053623 A053624 A053625 this_sequence A053627 A053628 A053629`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 20 2000`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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