id:A093192 - OEIS Search Results

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If M(n) is the n-th Mersenne prime, then a(n) is the smallest positive integer such that 2*a(n)*M(n)*M(n+1)*M(n+2)-1 is prime.

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1, 1, 21, 1, 12, 16, 6, 112, 76, 195, 61, 21, 511, 909, 1689, 517, 640, 487, 13615, 12547, 382, 60456 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`a(3) = 21: M(3) = 2^5-1 = 31; M(4) = 2^7-1 = 127; M(5) = 2^13-1 = 8191; 221311278191-1 = 1354414613, which is prime.`
	CROSSREFS	`Adjacent sequences: A093189 A093190 A093191 this_sequence A093193 A093194 A093195` `Sequence in context: A040456 A040457 A040458 this_sequence A040459 A040460 A040461`
	KEYWORD	`nonn`
	AUTHOR	`Ray G. Opao (1260(AT)email.com), Apr 21 2004`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.