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A023331
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Numbers n such that n remains prime through 5 iterations of function f(x) = 2x + 3.
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47, 67, 1427, 6047, 12097, 16057, 44507, 76537, 92387, 100057, 132707, 209647, 263387, 354247, 407947, 465407, 477727, 507757, 775237, 787477, 788687, 865327, 907367, 955457, 1015517, 1121387, 1178197, 1302277, 1360367, 1524247, 1623707
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Primes p such that (2*p+3), (4*p+9), (8*p+21), (16*p+45) and (32*p+93) are also prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [ p: p in PrimesUpTo(2000000) | IsPrime(p) and IsPrime(2*p+3) and IsPrime(4*p+9) and IsPrime(8*p+21) and IsPrime(16*p+45) and IsPrime(32*p+93)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A163390 A023303 A106874 * A187923 A103012 A166958
Adjacent sequences: A023328 A023329 A023330 * A023332 A023333 A023334
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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