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A023325
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Numbers n such that n remains prime through 4 iterations of function f(x) = 9x + 4.
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0
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3, 107, 421, 773, 1567, 1637, 3793, 4111, 6961, 12721, 14107, 17851, 26267, 26557, 31327, 33503, 37003, 42281, 57947, 60091, 65423, 67427, 68447, 75721, 82223, 82657, 87877, 96377, 108107, 111373, 113171, 122117, 123887, 125497, 125887, 127301
(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, 729*n+364 and 6561*n+3280 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..5000000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364) and IsPrime(6561*n+3280)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A139921 A176807 A142509 * A094200 A003705 A146214
Adjacent sequences: A023322 A023323 A023324 * A023326 A023327 A023328
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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