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A023340
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Numbers n such that n remains prime through 5 iterations of function f(x) = 4x + 9.
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18257, 19541, 22063, 48383, 73037, 73133, 78173, 88261, 93811, 101051, 104537, 152377, 153941, 162343, 168043, 175523, 204251, 211681, 238463, 287341, 375253, 386713, 423961, 659513, 672181, 676103, 688027, 741283, 759491, 770951, 786673
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 4*n+9, 16*n+45, 64*n+189, 256*n+765 and 1024*n+3069 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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PROG
| (MAGMA) [n: n in [1..10000000] | IsPrime(n) and IsPrime(4*n+9) and IsPrime(16*n+45) and IsPrime(64*n+189) and IsPrime(256*n+765) and IsPrime(1024*n+3069)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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CROSSREFS
| Sequence in context: A172936 A025029 A030331 * A145822 A203783 A071368
Adjacent sequences: A023337 A023338 A023339 * A023341 A023342 A023343
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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