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A023314
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Numbers n such that n remains prime through 4 iterations of function f(x) = 5x + 4.
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2
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263, 1217, 2141, 4673, 5333, 6983, 10973, 11423, 26669, 27143, 28697, 74843, 85061, 101063, 102647, 114113, 121001, 133349, 141623, 150497, 154823, 199877, 200183, 202409, 203039, 207953, 259697, 259781, 275813, 280487, 294167, 305477, 322727
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OFFSET
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1,1
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COMMENTS
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n, 5*n+4, 25*n+24, 125*n+124 and 625*n+624 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) == 11 or 41 (mod 42). - John Cerkan, Oct 07 2016
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PROG
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(MAGMA) [n: n in [1..1000000] | IsPrime(n) and IsPrime(5*n+4) and IsPrime(25*n+24) and IsPrime(125*n+124) and IsPrime(625*n+624)] // Vincenzo Librandi, Aug 04 2010
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CROSSREFS
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Subsequence of A023218, A023253, A023284, and A024897.
Sequence in context: A142379 A128654 A236245 * A054802 A239685 A108823
Adjacent sequences: A023311 A023312 A023313 * A023315 A023316 A023317
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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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