id:A074258 - OEIS Search Results

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Gaps between primes p such that 2p-1 is also prime.

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1, 4, 12, 12, 6, 42, 18, 42, 18, 42, 12, 18, 42, 36, 24, 6, 30, 12, 60, 60, 48, 30, 24, 6, 12, 42, 30, 36, 84, 18, 48, 60, 30, 30 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) lsgp=0; forprime (p=2, 1000, if (isprime(2*p-1), write("primegap.txt", p-lsgp); lsgp=p))`
	CROSSREFS	`First differences of A005382.` `Adjacent sequences: A074255 A074256 A074257 this_sequence A074259 A074260 A074261` `Sequence in context: A133517 A084415 A063608 this_sequence A120213 A005886 A096442`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Sep 20 2002`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research