id:A029707 - OEIS Search Results

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Numbers n such that the n-th and the (n+1)-st primes are twin primes.

+0
5

2, 3, 5, 7, 10, 13, 17, 20, 26, 28, 33, 35, 41, 43, 45, 49, 52, 57, 60, 64, 69, 81, 83, 89, 98, 104, 109, 113, 116, 120, 140, 142, 144, 148, 152, 171, 173, 176, 178, 182, 190, 201, 206, 209, 212, 215, 225, 230, 234, 236, 253, 256, 262, 265, 268, 277 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also n such that p(n)*p(n+1)+1 is a perfect square. - Zak Seidov (zakseidov(AT)yahoo.com), Oct 02 2002`
	LINKS	`Robert G. Wilson v, Table of n, a(n) for n = 1..86027`
	MATHEMATICA	`Select[ Range@300, PrimeQ[ Prime@# + 2] &] (* Robert G. Wilson v (rgwv@rgwv.com), Mar 11 2007 *)`
	CROSSREFS	`Cf. A014574, A029707, A007508. Equals PrimePi(A001359) (cf. A000720).` `Sequence in context: A008738 A022790 A053034 this_sequence A090499 A022335 A022780` `Adjacent sequences: A029704 A029705 A029706 this_sequence A029708 A029709 A029710`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 4 13:19 EDT 2008. Contains 140839 sequences.

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