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A023268
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Numbers n such that n remains prime through 2 iterations of function f(x) = 9x + 10.
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0
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11, 13, 43, 47, 67, 83, 89, 103, 109, 193, 197, 251, 281, 293, 383, 397, 449, 461, 601, 617, 641, 733, 757, 823, 839, 853, 887, 937, 967, 1013, 1069, 1091, 1447, 1489, 1733, 1741, 1789, 1931, 2111, 2237, 2239, 2251, 2339, 2521, 2539, 2647, 2671, 2693, 2797
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 9*n+10 and 81*n+100 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..100000] | IsPrime(n) and IsPrime(9*n+10) and IsPrime(81*n+100)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A132241 A045467 A108264 * A154292 A188386 A027450
Adjacent sequences: A023265 A023266 A023267 * A023269 A023270 A023271
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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