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A023320
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Numbers n such that n remains prime through 4 iterations of function f(x) = 8x + 3.
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13121, 117281, 188831, 317971, 429281, 624721, 627791, 722431, 774791, 883721, 924731, 946291, 1002721, 1083851, 1212011, 1221601, 1249111, 1342361, 1469761, 1665761, 1896901, 2003081, 2156251, 2336011, 2382761, 2391451, 2612021, 2634551
(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, 512*n+219 and 4096*n+1755 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(8*n+3) and IsPrime(64*n+27) and IsPrime(512*n+219) and IsPrime(4096*n+1755)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A015341 A157433 A089212 * A206149 A068760 A102331
Adjacent sequences: A023317 A023318 A023319 * A023321 A023322 A023323
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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