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A023250
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Numbers n such that n remains prime through 2 iterations of function f(x) = 4x + 3.
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0
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2, 7, 11, 37, 67, 89, 109, 149, 179, 257, 439, 467, 571, 677, 691, 719, 929, 977, 1019, 1279, 1381, 1447, 1549, 1567, 1747, 1787, 1901, 1931, 2111, 2161, 2207, 2287, 2347, 2377, 2459, 2539, 2671, 2711, 2819, 3119, 3229, 3371, 3491, 3607, 3637, 3821, 3877
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 4*n+3, 16*n+15 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [0..100000] | IsPrime(n) and IsPrime(4*n+3) and IsPrime(16*n+15)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A026133 A026162 A025189 * A106013 A175445 A073623
Adjacent sequences: A023247 A023248 A023249 * A023251 A023252 A023253
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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