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A023277
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Numbers n such that n remains prime through 3 iterations of function f(x) = 3x + 2.
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0
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29, 139, 1129, 1409, 2339, 2939, 3389, 4549, 7309, 10009, 10039, 11489, 12539, 13859, 15259, 17159, 17569, 20939, 22079, 24229, 24509, 27799, 28099, 29339, 30029, 32059, 33599, 34469, 37379, 37619, 39419, 41579, 42359, 44549, 52919, 55259, 57679, 58109
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 3*n+2, 9*n+8 and 27*n+26 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..100000] | IsPrime(n) and IsPrime(3*n+2) and IsPrime(9*n+8) and IsPrime(27*n+26)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A142622 A124957 A126416 * A123845 A042642 A172075
Adjacent sequences: A023274 A023275 A023276 * A023278 A023279 A023280
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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