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A023349
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Primes that remain prime through 5 iterations of function f(x) = 8x + 5.
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1
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109891, 324763, 852367, 3371527, 3557797, 4448701, 4471549, 5304661, 5616679, 5688919, 5727349, 7766659, 8028109, 8554999, 9034723, 10867099, 11146987, 12396487, 12926401, 14186611, 18274513, 19251517, 20882713, 21810493, 23953921
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OFFSET
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1,1
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COMMENTS
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Primes p such that 8*p+5, 64*p+45, 512*p+365, 4096*p+2925 and 32768*p+23405 are also primes. - Vincenzo Librandi, Aug 05 2010
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LINKS
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FORMULA
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MATHEMATICA
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p5Q[n_]:=And@@PrimeQ/@NestList[8#+5&, n, 5]; Parallelize[Select[Prime[Range[1510000]], p5Q]] (* Harvey P. Dale, Feb 22 2011 *)
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PROG
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(Magma) [n: n in [1..19000000] | IsPrime(n) and IsPrime(8*n+5) and IsPrime(64*n+45) and IsPrime(512*n+365) and IsPrime(4096*n+2925) and IsPrime(32768*n+23405)] // Vincenzo Librandi, Aug 05 2010
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CROSSREFS
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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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