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A023224
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Primes p such that 7*p + 4 is also prime.
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3
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7, 19, 37, 61, 79, 97, 139, 151, 157, 211, 229, 271, 307, 349, 379, 457, 487, 547, 571, 601, 607, 619, 631, 709, 751, 757, 769, 829, 877, 907, 937, 997, 1021, 1069, 1117, 1129, 1237, 1249, 1291, 1327, 1429, 1447, 1471, 1489, 1549, 1567, 1579, 1621, 1627, 1699
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OFFSET
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1,1
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COMMENTS
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Subsequence of A024902. All terms are congruent to 1 mod 6 because 7(6n + 5) + 4 is divisible by 3. - John Cerkan, Jul 08 2016
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LINKS
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MAPLE
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MATHEMATICA
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Select[Prime[Range[300]], PrimeQ[7# + 4] &] (* Alonso del Arte, Nov 21 2018 *)
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PROG
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(Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(7*n+4)] // Vincenzo Librandi, Nov 19 2010
(PARI) lista(nn) = for(p=2, nn, if(isprime(7*p+4), print1(p, ", "))); \\ Altug Alkan, Jul 08 2016
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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