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A023249
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Numbers n such that n remains prime through 2 iterations of function f(x) = 3x + 10.
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0
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3, 7, 11, 17, 19, 47, 67, 109, 149, 151, 199, 227, 233, 347, 353, 359, 397, 431, 457, 487, 563, 571, 577, 607, 709, 809, 919, 947, 997, 1013, 1033, 1069, 1103, 1117, 1151, 1187, 1279, 1361, 1367, 1451, 1601, 1607, 1697, 1699, 1801, 1811, 1823, 1831, 1871, 1913
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 3*n+10, 9*n+40 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(3*n+10) and IsPrime(9*n+40)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A045419 A049098 A119992 * A090513 A191050 A081515
Adjacent sequences: A023246 A023247 A023248 * A023250 A023251 A023252
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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