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A023298
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Numbers n such that n remains prime through 3 iterations of function f(x) = 9x + 8.
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0
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11, 61, 251, 397, 467, 727, 907, 1747, 1901, 2221, 2617, 3121, 3527, 3581, 4001, 4099, 4211, 4759, 5231, 5717, 6277, 6661, 6689, 7237, 7877, 8117, 8171, 8581, 9371, 9587, 11171, 12457, 12539, 13109, 14221, 15187, 15731, 16069, 16477, 16979, 17117, 17491
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 9*n+8, 81*n+80, 729*n+728 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(9*n+8) and IsPrime(81*n+80) and IsPrime(729*n+728)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A141935 A001847 A089764 * A106992 A115565 A137410
Adjacent sequences: A023295 A023296 A023297 * A023299 A023300 A023301
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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