id:A108316 - OEIS Search Results

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Least k such that (k*n)^2 + k*n -1 and (k*n)^2 + k*n +1 are twin primes.

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2, 1, 1, 2, 1, 1, 3, 1, 6, 2, 6, 2, 2, 27, 1, 11, 9, 3, 2, 1, 1, 3, 6, 1, 2, 1, 2, 20, 7, 24, 5, 9, 2, 107, 13, 8, 8, 1, 9, 14, 1, 9, 5, 4, 9, 3, 3, 6, 14, 1, 3, 12, 10, 1, 9, 10, 8, 5, 1, 12 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`(21)^2 + 21 -1 = 5, (21)^2 + 21 +1 = 7, 5 and 7 twin primes so k(1)=2`
	CROSSREFS	`Sequence in context: A153096 A078770 A072038 this_sequence A145574 A056138 A067594` `Adjacent sequences: A108313 A108314 A108315 this_sequence A108317 A108318 A108319`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Jul 25 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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