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A023213
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Numbers n such that n and 4n + 3 both prime.
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8
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2, 5, 7, 11, 17, 19, 31, 37, 41, 47, 59, 67, 89, 107, 109, 149, 151, 157, 179, 181, 227, 229, 241, 257, 271, 307, 331, 349, 359, 367, 389, 401, 439, 457, 461, 467, 487, 499, 509, 521, 571, 577, 587, 599, 647, 661, 677, 691, 719, 769, 797, 829, 839, 877, 881, 907, 929, 941
(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[4*p+3], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 10 2009]
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PROG
| (MAGMA) [ n: n in PrimesUpTo(1000) | IsPrime(4*n+3) ]; [From V.Librandi, Nov 20 2010]
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CROSSREFS
| Sequence in context: A045348 A023207 A038611 * A162575 A066408 A142352
Adjacent sequences: A023210 A023211 A023212 * A023214 A023215 A023216
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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