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A023257 Numbers n such that n remains prime through 2 iterations of function f(x) = 6x + 5. 4
2, 11, 13, 17, 31, 37, 41, 43, 71, 73, 79, 83, 97, 137, 139, 151, 163, 181, 191, 193, 197, 269, 277, 307, 317, 347, 373, 409, 431, 503, 577, 743, 811, 823, 911, 919, 941, 967, 983, 1021, 1033, 1049, 1051, 1093, 1163, 1187, 1201, 1361, 1373, 1423, 1493, 1571, 1597 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that n, 6*n+5 and 36*n+35 are primes. - Vincenzo Librandi, Aug 04 2010

LINKS

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

PROG

(MAGMA) [n: n in [1..100000] | IsPrime(n) and IsPrime(6*n+5) and IsPrime(36*n+35)] // Vincenzo Librandi, Aug 04 2010

CROSSREFS

Subsequence of A023221.

Sequence in context: A259394 A079132 A184802 * A178796 A068807 A241732

Adjacent sequences:  A023254 A023255 A023256 * A023258 A023259 A023260

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 25 02:04 EDT 2019. Contains 323534 sequences. (Running on oeis4.)