id:A112857 - OEIS Search Results

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Numbers n such that (2*n)!/(n!)^2-1 is prime.

+0
5

2, 3, 5, 9, 15, 29, 43, 51, 113, 184, 213, 222, 267, 279, 369, 402, 441, 603, 812, 839, 902, 1422, 1542, 1824, 2983, 3065, 3911, 3958, 4192, 4587, 4865, 5543, 5837, 7902, 9299, 9722 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Next term is > 10000.`
	CROSSREFS	`Cf. A092751 = primes of the form (2n)!/(n!)^2-1, A112853 = (2n)!/n!-1 is prime, A112855 = (2n)!/n!+1 is prime, A112859 = (2n)!/(n!)^2+1 is prime, A112861 = (2n)!/(2(n!)^2)-1 is prime, A112863 = (2n)!/(2(n!)^2)+1 is prime.` `Sequence in context: A065956 A060013 A092424 this_sequence A066726 A124642 A011826` `Adjacent sequences: A112854 A112855 A112856 this_sequence A112858 A112859 A112860`
	KEYWORD	`hard,nonn`
	AUTHOR	`Hugo Pfoertner (hugo(AT)pfoertner.org), Sep 25 2005`

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

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