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A023296
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Numbers n such that n remains prime through 3 iterations of function f(x) = 9x + 2.
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0
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19, 103, 113, 151, 239, 283, 313, 599, 929, 1481, 2411, 2549, 2593, 2741, 2819, 2969, 3931, 4091, 4463, 4523, 5279, 5923, 6781, 7759, 8209, 8363, 9749, 10133, 10531, 12919, 14071, 15053, 15361, 16229, 16453, 16493, 16573, 16703, 17041, 17783, 18253
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 9*n+2, 81*n+20 and 729*n+182 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+2) and IsPrime(81*n+20) and IsPrime(729*n+182)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A061696 A062643 A054658 * A139948 A101010 A201854
Adjacent sequences: A023293 A023294 A023295 * A023297 A023298 A023299
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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