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A023230
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Numbers k such that k and 8*k + 5 are both prime.
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8
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3, 7, 13, 19, 43, 67, 103, 109, 127, 139, 151, 181, 193, 199, 211, 223, 241, 277, 283, 349, 379, 397, 421, 433, 439, 463, 577, 601, 607, 613, 619, 727, 733, 787, 829, 853, 883, 967, 991, 1033, 1039, 1117, 1201, 1237, 1291, 1303, 1399, 1429, 1459, 1531, 1567, 1579
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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PROG
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(Magma) [ p: p in PrimesUpTo(1580) | IsPrime(8*p+5) ]; // Klaus Brockhaus, Dec 21 2008
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CROSSREFS
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Cf. A007521 (primes of form 8n+5), A105133 (numbers n such that 8n+5 is prime).
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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