A108316 - OEIS

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A108316

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

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; refs; listen; history; internal format)

	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 * A145574 A056138 A067594` `Adjacent sequences: A108313 A108314 A108315 * A108317 A108318 A108319`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Jul 25 2005`

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.