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A023274
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Numbers n such that n remains prime through 3 iterations of function f(x) = 2x + 5.
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2
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13, 31, 37, 67, 73, 181, 367, 541, 661, 997, 1087, 1117, 1327, 1861, 2179, 2293, 2473, 2713, 2719, 3271, 3727, 4363, 5281, 5443, 5749, 7459, 8089, 8707, 9109, 9181, 9337, 10357, 10639, 12553, 13183, 14923, 16183, 16249, 17341, 17419, 17761, 17923, 17989
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 2*n+5, 4*n+15 and 8*n+35 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(2*n+5) and IsPrime(4*n+15) and IsPrime(8*n+35)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A040050 A040086 A176181 * A129864 A080387 A097443
Adjacent sequences: A023271 A023272 A023273 * A023275 A023276 A023277
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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