id:A065406 - OEIS Search Results

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Mersenne prime exponents (A000043) which are also Sophie Germain primes (A005384).

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2, 3, 5, 89, 9689, 21701, 859433 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`31=2^5-1 and 11=2*5+1 are primes.`
	CROSSREFS	`Cf. A000043, A005384.` `Sequence in context: A084960 A087543 A124121 this_sequence A111331 A118505 A067799` `Adjacent sequences: A065403 A065404 A065405 this_sequence A065407 A065408 A065409`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 06 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.