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A023254 Numbers n such that n remains prime through 2 iterations of the function f(x) = 5x + 6. 4
7, 11, 29, 41, 53, 79, 83, 107, 113, 137, 139, 149, 163, 181, 193, 233, 239, 359, 379, 401, 449, 487, 503, 547, 601, 643, 653, 809, 839, 877, 883, 911, 1009, 1087, 1093, 1103, 1117, 1171, 1259, 1289, 1303, 1367, 1373, 1481, 1511, 1579, 1637, 1747, 1787, 1801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that n, 5*n+6, and 25*n+36 are primes. - Vincenzo Librandi, Aug 04 2010

LINKS

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

PROG

(MAGMA) [n: n in [0..100000] | IsPrime(n) and IsPrime(5*n+6) and IsPrime(25*n+36)] // Vincenzo Librandi, Aug 04 2010

CROSSREFS

Subsequence of A081759.

Sequence in context: A136338 A193867 A110572 * A129807 A045461 A153867

Adjacent sequences:  A023251 A023252 A023253 * A023255 A023256 A023257

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 19 00:55 EDT 2019. Contains 324217 sequences. (Running on oeis4.)