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A023263
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Numbers n such that n remains prime through 2 iterations of function f(x) = 8x + 7.
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0
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2, 5, 107, 137, 179, 197, 227, 359, 419, 617, 659, 839, 977, 1097, 1217, 1409, 1487, 1559, 1637, 2087, 2339, 2447, 2549, 2609, 2687, 2909, 2957, 3167, 3299, 3467, 3719, 4139, 4409, 4787, 4919, 4937, 5147, 5189, 5279, 5639, 6047, 6269, 7229, 7547, 7949
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 8*n+7 and 64*n+63 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(8*n+7)and IsPrime(64*n+63)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A132482 A136106 A122696 * A070855 A041237 A015172
Adjacent sequences: A023260 A023261 A023262 * A023264 A023265 A023266
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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