id:A104060 - OEIS Search Results

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Least k such that k*(k+1)*2^n-1 is prime.

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1, 1, 2, 1, 2, 1, 9, 4, 3, 2, 17, 1, 5, 7, 9, 1, 2, 1, 17, 11, 9, 12, 20, 14, 24, 6, 9, 9, 41, 1, 14, 3, 2, 23, 9, 3, 2, 17, 59, 5, 3, 2, 30, 11, 21, 4, 39, 21, 41, 6, 32, 4, 3, 2, 72, 10, 39, 9, 72, 1, 36, 3, 2, 14, 17, 13, 84, 10, 15, 4, 122, 5, 6, 3, 2, 10, 41, 15, 5, 13, 5, 13, 90, 9, 38, 32 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`When k(n)=1 n+1 is prime and the prime is a Mersenne-prime when k(n)=3 then k(n+1)=2 and same prime for n and n+1`
	EXAMPLE	`122^1-1=3 prime so k(1)=1` `122^2-1=7 prime so k(2)=1` `232^3-1=47 prime so k(3)=2` `9102^7-1=11519 prime so k(7)=9`
	CROSSREFS	`Adjacent sequences: A104057 A104058 A104059 this_sequence A104061 A104062 A104063`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Mar 31 2005`
	EXTENSIONS	`Reformulated the definition - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 13 2009`

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

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