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A023357
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Numbers n such that n remains prime through 5 iterations of function f(x) = 10x + 9.
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0
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13, 293, 6089, 12823, 37967, 40949, 121687, 192037, 243487, 379679, 409499, 471841, 1006193, 1217131, 1397311, 1438793, 1503613, 1541063, 1754591, 2058629, 2088421, 2346791, 2360357, 2428243, 2458609, 2621527, 2646167, 2721053, 3223247, 3280003
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 10*n+9, 100*n+99, 1000*n+999, 10000*n+9999 and 100000*n+99999 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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PROG
| (MAGMA) [n: n in [1..19000000] | IsPrime(n) and IsPrime(10*n+9) and IsPrime(100*n+99) and IsPrime(1000*n+999) and IsPrime(10000*n+9999) and IsPrime(100000*n+99999)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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CROSSREFS
| Sequence in context: A092145 A035017 A064750 * A165218 A076130 A035272
Adjacent sequences: A023354 A023355 A023356 * A023358 A023359 A023360
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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