id:A051800 - OEIS Search Results

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

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

	OFFSET	`1,2`
	EXAMPLE	`5 is a member because 2(2357*11)+1=4621 is prime`
	CROSSREFS	`2*A002110[n]+1 is prime. Cf. A051887, A051915.` `Sequence in context: A116068 A104420 A052418 this_sequence A121432 A118968 A073528` `Adjacent sequences: A051797 A051798 A051799 this_sequence A051801 A051802 A051803`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 20 1999`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.