id:A023217 - OEIS Search Results

Search: id:A023217

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Numbers n such that n and 5n + 2 are both prime.

+0
4

3, 7, 13, 19, 31, 61, 67, 73, 79, 97, 109, 151, 157, 181, 193, 199, 223, 313, 331, 349, 373, 397, 457, 487, 523, 541, 571, 577, 607, 613, 643, 661, 691, 709, 727, 739, 769, 811, 859, 919, 991, 997, 1021, 1033, 1039, 1069, 1087, 1129, 1171, 1201, 1213, 1249, 1279, 1321 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`lst={}; Do[p=Prime[n]; If[PrimeQ[5*p+2], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 16 2009]`
	CROSSREFS	`Sequence in context: A023237 A106061 A155703 this_sequence A106077 A048977 A154650` `Adjacent sequences: A023214 A023215 A023216 this_sequence A023218 A023219 A023220`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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