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A023314 Numbers n such that n remains prime through 4 iterations of function f(x) = 5x + 4. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

n, 5*n+4, 25*n+24, 125*n+124 and 625*n+624 are primes. - Vincenzo Librandi, Aug 04 2010

LINKS

John Cerkan, Table of n, a(n) for n = 1..10000

FORMULA

a(n) == 11 or 41 (mod 42). - John Cerkan, Oct 07 2016

PROG

(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

CROSSREFS

Subsequence of A023218, A023253, A023284, and A024897.

Sequence in context: A142379 A128654 A236245 * A054802 A239685 A108823

Adjacent sequences:  A023311 A023312 A023313 * A023315 A023316 A023317

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 29 05:48 EDT 2020. Contains 337425 sequences. (Running on oeis4.)