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A023292
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Numbers n such that n remains prime through 3 iterations of function f(x) = 8x + 3.
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0
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31, 191, 821, 3271, 11171, 13121, 14591, 21521, 27751, 30341, 35951, 37561, 39671, 40231, 43651, 51061, 51551, 56671, 68161, 73681, 84871, 91541, 92581, 102031, 102871, 102881, 104971, 117281, 127781, 128201, 128551, 128761, 138511, 148091
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 8*n+3, 64*n+27 and 512*n+219 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(8*n+3) and IsPrime(64*n+27) and IsPrime(512*n+219)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A042876 A042878 A165130 * A100689 A055816 A139998
Adjacent sequences: A023289 A023290 A023291 * A023293 A023294 A023295
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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