id:A070251 - OEIS Search Results

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Unrelated-factorial numbers: product of numbers unrelated to n (numbers which have a common divisor with n but do not divide n).

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1, 1, 1, 1, 1, 4, 1, 6, 6, 192, 1, 720, 1, 23040, 6480, 10080, 1, 12902400, 1, 34836480, 2449440, 1857945600, 1, 50295168000, 3000, 980995276800, 9797760, 9564703948800, 1, 1518492398911488000, 1, 41845579776000, 1571364748800 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`a(p) = 1 if p is a prime. 4 is the only composite number such that a(4) = 1.`
	FORMULA	`a(n) = A055067(n)/A001783(n). - Vladeta Jovovic (vladeta(AT)Eunet.yu), May 06 2002`
	CROSSREFS	`Adjacent sequences: A070248 A070249 A070250 this_sequence A070252 A070253 A070254` `Sequence in context: A021100 A021028 A066575 this_sequence A134234 A124739 A122662`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 05 2002`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), May 06 2002`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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