id:A130003 - OEIS Search Results

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a(n) is the smallest natural number m such that 4^k + m is prime for all k=1,2,...,n.

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1, 1, 3, 7, 7, 15, 37, 163, 177, 4503, 4503, 4503, 4503, 4503, 833021343, 12465115083, 95854279610863, 1158174141556287 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`Carlos Rivera, 1(1198).4.1(3304).4441 .` `Carlos Rivera, Puzzle 403. 833021343.`
	EXAMPLE	`a(14)=4503 because 4^k + 4503 for 0<k<15 are prime and there is no smaller number with this property.`
	CROSSREFS	`Cf. A130004.` `Adjacent sequences: A130000 A130001 A130002 this_sequence A130004 A130005 A130006` `Sequence in context: A060215 A059478 A081218 this_sequence A098581 A085420 A160994`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), May 30 2007, Jun 04 2007`
	EXTENSIONS	`More terms from Jens Kruse Andersen (jens.k.a(AT)get2net.dk), Jun 08 2007`

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Last modified November 7 16:45 EST 2009. Contains 166093 sequences.