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A023278
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Numbers n such that n remains prime through 3 iterations of function f(x) = 3x + 4.
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0
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23, 683, 1663, 2753, 3203, 6073, 6323, 7523, 8243, 9293, 9613, 15173, 19913, 21023, 21683, 25183, 26633, 29663, 34613, 34703, 39293, 41953, 43283, 45533, 52813, 59393, 62473, 65053, 66763, 71713, 71993, 81533, 81953, 84523, 87833, 103843, 104183
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 3*n+4, 9*n+16 and 27*n+52 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..150000] | IsPrime(n) and IsPrime(3*n+4) and IsPrime(9*n+16) and IsPrime(27*n+52)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A169596 A142553 A123782 * A013362 A013365 A127230
Adjacent sequences: A023275 A023276 A023277 * A023279 A023280 A023281
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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