id:A102478 - OEIS Search Results

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Numbers n such that the concatenations (2*n),(2*n-1) and (2*n),(2*n+1) give twin primes.

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21, 39, 51, 54, 90, 96, 135, 150, 156, 165, 171, 195, 210, 261, 270, 306, 330, 411, 420, 441, 501, 570, 615, 636, 741, 771, 816, 885, 1050, 1095, 1341, 1371, 1536, 1599, 1704, 1821, 1914, 2121, 2226, 2286, 2370, 2394, 2499, 2811, 2859, 2916, 3051, 3129, 3714 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`221=42, 4241 and 4243 are twin primes so a(1)=21` `239=78, 7877 and 7879 are twin primes so a(2)=39`
	CROSSREFS	`Sequence in context: A061906 A139768 A072708 this_sequence A020220 A084856 A070666` `Adjacent sequences: A102475 A102476 A102477 this_sequence A102479 A102480 A102481`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Feb 24 2005`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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