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A023297
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Numbers n such that n remains prime through 3 iterations of function f(x) = 9x + 4.
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0
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3, 31, 37, 41, 107, 421, 773, 967, 1451, 1567, 1571, 1637, 1973, 3011, 3793, 4111, 4217, 4703, 5783, 6961, 7331, 8443, 8627, 9323, 10733, 12071, 12413, 12721, 12967, 13523, 14107, 14503, 14737, 15647, 17851, 17881, 19853, 19991, 20051, 20233, 22157, 23291
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 9*n+4, 81*n+40 and 729*n+364 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..450000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A090543 A139090 A042477 * A077546 A168274 A141177
Adjacent sequences: A023294 A023295 A023296 * A023298 A023299 A023300
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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