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A023322
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Numbers n such that n remains prime through 4 iterations of function f(x) = 8x + 7.
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2
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7949, 25589, 55799, 61379, 69959, 70229, 74609, 174569, 188369, 204719, 220469, 225629, 233759, 250919, 286619, 363659, 552749, 592139, 658349, 735419, 783269, 827549, 931949, 1018889, 1065839, 1126319, 1132739, 1187939, 1215629, 1378529
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OFFSET
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1,1
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COMMENTS
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n, 8*n+7, 64*n+63, 512*n+511 and 4096*n+4095 are primes. - Vincenzo Librandi, Aug 04 2010
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LINKS
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John Cerkan, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n) == 9 (mod 10). - John Cerkan, Oct 08 2016
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PROG
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(MAGMA) [n: n in [1..5000000] | IsPrime(n) and IsPrime(8*n+7) and IsPrime(64*n+63) and IsPrime(512*n+511) and IsPrime(4096*n+4095)] // Vincenzo Librandi, Aug 04 2010
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CROSSREFS
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Subsequence of A023231, A023263, A023294, and A139487.
Sequence in context: A302901 A179708 A162010 * A064246 A260959 A316906
Adjacent sequences: A023319 A023320 A023321 * A023323 A023324 A023325
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson
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STATUS
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approved
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