id:A081945 - OEIS Search Results

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A081945

Numbers n such that n(n + 1) + 1 as well as n(n - 1) + 1 are both primes.

+0
2

2, 3, 6, 15, 21, 78, 90, 111, 162, 168, 189, 246, 279, 288, 405, 435, 456, 531, 567, 762, 819, 960, 993, 1002, 1092, 1098, 1149, 1182, 1275, 1365, 1422, 1443, 1449, 1548, 1560, 1659, 1701, 1848, 1932, 1974, 2016, 2163, 2205, 2373, 2430, 2451, 2484, 2541 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`6 is a member since 67+1=43 and 65+1=31 are both primes.`
	CROSSREFS	`Cf. A081944.` `Sequence in context: A091138 A090983 A066653 this_sequence A158027 A100249 A138477` `Adjacent sequences: A081942 A081943 A081944 this_sequence A081946 A081947 A081948`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 02 2003`
	EXTENSIONS	`More terms from Don Reble (djr(AT)nk.ca), Apr 08 2003`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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