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A023265
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Numbers n such that n remains prime through 2 iterations of function f(x) = 9x + 2.
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1
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3, 11, 19, 31, 103, 109, 113, 131, 151, 173, 179, 239, 283, 313, 491, 521, 599, 619, 733, 739, 773, 929, 1019, 1103, 1361, 1439, 1481, 1621, 1709, 1741, 1831, 1993, 2083, 2153, 2293, 2411, 2549, 2551, 2593, 2689, 2741, 2819, 2843, 2969, 3001, 3623, 3931, 4001
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 9*n+2 and 81*n+20 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(9*n+2) and IsPrime(81*n+20)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A175122 A031369 A014223 * A018557 A085616 A138723
Adjacent sequences: A023262 A023263 A023264 * A023266 A023267 A023268
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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