A084713 - OEIS

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A084713

Smallest prime of the form (2n-1)^k + 2, or 0 if no such number exists.

3, 5, 7, 0, 11, 13, 0, 17, 19, 0, 23, 952809757913929, 0, 29, 31, 0, 1091, 37, 0, 41, 43, 0, 47 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(3n+1) = 0, a(24) = 47^113 - 2 is a 189-digit number.`
	EXAMPLE	`a(12) = 952809757913927 = 23^11 + 2.`
	CROSSREFS	`Cf. A084714.` `Sequence in context: A024601 A173013 A085090 * A162538 A084712 A031100` `Adjacent sequences: A084710 A084711 A084712 * A084714 A084715 A084716`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 10 2003`
	EXTENSIONS	`Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 11, 2003`

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Last modified February 15 18:45 EST 2012. Contains 205835 sequences.