A051800 - OEIS

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A051800

Numbers n such that 1 + double of product of first n primes is also a prime.

1, 2, 3, 4, 5, 11, 18, 23, 26, 30, 80, 120, 148, 220 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`5 is a member because 2(2357*11)+1=4621 is prime`
	CROSSREFS	`2A002110[n]+1 is prime. Cf. A051887, A051915.` `Sequence in context: A188532 A181288 A052418 A121432 A118968 A073528` `Adjacent sequences: A051797 A051798 A051799 * A051801 A051802 A051803`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 20 1999`

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Last modified February 14 15:32 EST 2012. Contains 205635 sequences.