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A023300
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Numbers n such that n remains prime through 3 iterations of function f(x) = 10x + 3.
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0
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2, 7, 17, 19, 23, 61, 101, 103, 409, 719, 857, 997, 1297, 1531, 1699, 2399, 3253, 3491, 4583, 4933, 5119, 5189, 5939, 6277, 6863, 7789, 8669, 9187, 9887, 10061, 10253, 10267, 11027, 11777, 12791, 12899, 13669, 17209, 17293, 17489, 17839, 19211, 19379
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n, 10*n+3, 100*n+33 and 1000*n+333 are primes. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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PROG
| (MAGMA) [n: n in [1..450000] | IsPrime(n) and IsPrime(10*n+3) and IsPrime(100*n+33) and IsPrime(1000*n+333)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 04 2010]
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CROSSREFS
| Sequence in context: A079815 A006883 A023269 * A045378 A101568 A074884
Adjacent sequences: A023297 A023298 A023299 * A023301 A023302 A023303
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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