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A023217
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Numbers n such that n and 5n + 2 are both prime.
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3
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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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]
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PROG
| (MAGMA) [n: n in [0..1000] | IsPrime(n) and IsPrime(5*n+2)] [From V.Librandi, Nov 20 2010]
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CROSSREFS
| Sequence in context: A023237 A106061 A155703 * A106077 A048977 A154650
Adjacent sequences: A023214 A023215 A023216 * A023218 A023219 A023220
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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