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A023331
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Primes that remain prime through 5 iterations of function f(x) = 2x + 3.
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2
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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
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OFFSET
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1,1
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COMMENTS
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Primes p such that 2*p+3, 4*p+9, 8*p+21, 16*p+45 and 32*p+93 are also prime. - Vincenzo Librandi, Aug 04 2010
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LINKS
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MATHEMATICA
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Select[Prime[Range[20000]], And@@PrimeQ[NestList[2 # + 3 &, #, 5]] &] (* Vincenzo Librandi, Jun 25 2014 *)
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PROG
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(Magma) [p: p in PrimesUpTo(2000000) | IsPrime(2*p+3) and IsPrime(4*p+9) and IsPrime(8*p+21) and IsPrime(16*p+45) and IsPrime(32*p+93)]; // Vincenzo Librandi, Aug 04 2010
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CROSSREFS
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Cf. A023303 (through 4 iterations).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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