A131356 - OEIS

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A131356

Numbers n such that p1=10n+9 and p2=p1+2 are twin primes (and p1^2 == p2^2 == 1 mod 10).

2, 5, 14, 17, 23, 26, 41, 56, 59, 65, 80, 101, 104, 122, 128, 131, 161, 194, 212, 230, 233, 254, 272, 278, 296, 299, 311, 329, 332, 335, 338, 353, 392, 401, 404, 422, 425, 464, 479, 500, 509, 527, 551, 563, 584, 587, 608, 626, 629, 635, 644, 656, 665, 668, 677 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`All numbers n == 2 mod 3, all p1+1 are of form 30m with m=1, 2, 5, 6, 8, 9, 14, 19, 20, 22, 27, 34, 35, 41, 43, 44, 54, 65, 71, 77, 78, 85, 91, 93, 99, 100, 104, 110, 111, 112, 113, 118, 131, 134, 135, 141, 142, 155, 160, 167, 170, 176, 184, 188, 195, 196, 203, 209, 210, 212, 215, 219, 222, 223, 226, 229, 232, 245, 252, 253, 265, 267, 274, 281, 294, 299, 300, 308, 314, 321, 324, 331. Also all p1 are of the form 6r-1 (=lesser of twin primes) with r=5m.`
	MATHEMATICA	`Select[Range[1200], PrimeQ[10#+9]&&PrimeQ[10#+11]&]`
	CROSSREFS	`Sequence in context: A120626 A046058 A137271 * A191119 A089410 A118670` `Adjacent sequences: A131353 A131354 A131355 * A131357 A131358 A131359`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 30 2007`

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Last modified February 16 11:30 EST 2012. Contains 205907 sequences.