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 A023217 Numbers n such that n and 5n + 2 are both prime. 3
 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; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA lst={}; Do[p=Prime[n]; If[PrimeQ[5*p+2], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Joseph Stephan Orlovsky, Aug 16 2009] PROG (MAGMA) [n: n in [0..1000] | IsPrime(n) and IsPrime(5*n+2)] [From V.Librandi, Nov 20 2010] CROSSREFS Sequence in context: A023237 A106061 A155703 * A106077 A216515 A048977 Adjacent sequences:  A023214 A023215 A023216 * A023218 A023219 A023220 KEYWORD nonn AUTHOR STATUS approved

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