id:A088485 - OEIS Search Results

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Numbers n such that n^2 + n - 1 and n^2 + n + 1 are twin primes.

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2, 3, 5, 6, 8, 15, 20, 21, 24, 38, 41, 50, 54, 59, 66, 89, 101, 131, 138, 141, 153, 155, 164, 176, 188, 203, 206, 209, 215, 218, 231, 236, 246, 288, 290, 309, 314, 351, 378, 395, 405, 453, 455, 456, 495, 500 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	EXAMPLE	`20*20 + 20 -1 = 419, 419 and 421 twin primes, 20 is the 7-th of the sequence`
	MATHEMATICA	`Select[Range[500], PrimeQ[ #^2+#-1] && PrimeQ[ #^2+#+1] &]`
	CROSSREFS	`Sequence in context: A050028 A139443 A088497 this_sequence A128994 A098211 A073673` `Adjacent sequences: A088482 A088483 A088484 this_sequence A088486 A088487 A088488`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (colettecami(AT)aol.com), Nov 09 2003`
	EXTENSIONS	`Corrected description and Mma program from T. D. Noe (noe(AT)sspectra.com), Jun 22 2004`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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