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A023280
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Numbers n such that n remains prime through 3 iterations of function f(x) = 3x + 10.
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0
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3, 19, 47, 149, 199, 233, 353, 563, 607, 709, 919, 1013, 1361, 1367, 1697, 1801, 1871, 2137, 2203, 2819, 2879, 2917, 3041, 3229, 3449, 3701, 3943, 4093, 4111, 4177, 4567, 4973, 5519, 5689, 5987, 6053, 6359, 6421, 6841, 7019, 7283, 8647, 8951, 9109, 9719
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 3*n+10, 9*n+40 and 27*n+130 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+10) and IsPrime(9*n+40) and IsPrime(27*n+130)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A201875 A063553 A099007 * A054697 A112627 A100697
Adjacent sequences: A023277 A023278 A023279 * A023281 A023282 A023283
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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