id:A066759 - OEIS Search Results

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a(n) = least multiple of n differing from a prime by at most 1, if such a multiple exists; = 0 otherwise.

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1, 2, 3, 4, 5, 6, 7, 8, 18, 10, 11, 12, 13, 14, 30, 16, 17, 18, 19, 20, 42, 22, 23, 24, 100, 52, 54, 28, 29, 30, 31, 32, 66, 68, 70, 36, 37, 38, 78, 40, 41, 42, 43, 44, 90, 46, 47, 48, 98, 100, 102, 52, 53, 54, 110, 112, 114, 58, 59, 60, 61, 62, 126, 128, 130, 66, 67, 68 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) is nonzero for all n up to 10^4. Is it always so?`
	EXAMPLE	`9 differs by 2 from the nearest prime, but 9 * 2 = 18 differs only by 1; hence a(9) = 18.`
	CROSSREFS	`Sequence in context: A032943 A115309 A146029 this_sequence A039050 A114799 A055557` `Adjacent sequences: A066756 A066757 A066758 this_sequence A066760 A066761 A066762`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 17 2002`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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