A117522 - OEIS

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A117522

Numbers n such that L(2*n + 1) is prime where L(m) is the Lucas number.

2, 3, 5, 6, 8, 9, 15, 18, 20, 23, 26, 30, 35, 39, 56, 156, 176, 251, 306, 308, 431, 548, 680 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	EXAMPLE	`If n=56 then L(2*n + 1) is a prime with twenty four digits.`
	CROSSREFS	`Cf. A000032, A001606.` `Sequence in context: A153775 A173666 A063756 * A028374 A050578 A028776` `Adjacent sequences: A117519 A117520 A117521 * A117523 A117524 A117525`
	KEYWORD	`nonn`
	AUTHOR	`Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 26 2006`

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.