A122724 - OEIS

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A122724

Primes p such that (2p)! - 1 is also prime.

2, 3, 7, 19, 47, 83, 487 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Corresponding primes of the form (2p)! - 1 are {23,719,87178291199,523022617466601111760007224100074291199999999,...}.` `Verified the first seven terms are: 2, 3, 7, 19, 47, 83, 487. If another term exists, then p>5476. [From Robert Price (pamandbobprice(AT)yahoo.com), Dec 09 2009]`
	CROSSREFS	`Cf. A002982, A103317.` `Sequence in context: A152609 A172461 A091410 * A033844 A037028 A052919` `Adjacent sequences: A122721 A122722 A122723 * A122725 A122726 A122727`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), Sep 23 2006`

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Last modified February 13 18:40 EST 2012. Contains 205535 sequences.