id:A092702 - OEIS Search Results

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If P(n) is the product of the first n Mersenne primes, then a(n) is the smallest positive integer such that 2*a(n)*P(n)-1 is prime.

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1, 1, 1, 8, 1, 12, 4, 33, 3, 19, 22, 71, 58, 10, 230, 1487, 2887, 555, 1260, 1711, 377, 343 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(2) starts sequence A092527`
	EXAMPLE	`a(4) = 8: 28(2^2-1)(2^3-1)(2^5-1)(2^7-1)-1 = 283731127-1 = 1322832-1 = 1322831, which is prime.`
	CROSSREFS	`Adjacent sequences: A092699 A092700 A092701 this_sequence A092703 A092704 A092705` `Sequence in context: A106627 A099614 A032012 this_sequence A070475 A045771 A070488`
	KEYWORD	`nonn`
	AUTHOR	`Ray G. Opao (1260(AT)email.com), Apr 12 2004`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.