id:A051507 - OEIS Search Results

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Primes p such that p*q+2 is prime, where q is next prime after p.

+0
2

3, 5, 7, 13, 19, 67, 149, 179, 229, 239, 241, 269, 277, 307, 313, 397, 401, 419, 439, 487, 569, 613, 643, 701, 823, 863, 887, 1051, 1289, 1319, 1489, 1609, 1693, 1783, 1873, 1999, 2143, 2239, 2309, 2423, 2539, 2549, 2593, 2617, 2729, 2753, 2819 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`ct = 0; Do[If[PrimeQ[Prime[k]*Prime[k + 1] + 2], ct++; n[ct] = Prime[k]], {k, 1, 640}]; Table[n[k], {k, 1, ct}] (Lei Zhou)`
	CROSSREFS	`Cf. A048880.` `Sequence in context: A084696 A093326 A154700 this_sequence A060274 A005235 A107664` `Adjacent sequences: A051504 A051505 A051506 this_sequence A051508 A051509 A051510`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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