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A287459
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Primes p such that (15 p + 1)/2 is prime.
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1
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3, 7, 11, 23, 31, 47, 59, 67, 79, 103, 127, 131, 163, 191, 199, 211, 263, 311, 359, 367, 379, 443, 479, 523, 571, 599, 619, 631, 659, 719, 743, 787, 823, 827, 863, 887, 907, 911, 947, 967, 971, 991, 1019, 1039, 1051, 1103, 1123, 1171, 1223, 1283, 1307, 1367, 1447, 1451, 1499, 1523, 1531, 1571, 1619
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OFFSET
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1,1
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COMMENTS
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If n is in the sequence, then 15 n is in A068405.
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LINKS
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EXAMPLE
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23 and (15*23+1)/2 = 173 are prime, so 23 is in the sequence.
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MAPLE
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select(p -> isprime(p) and isprime((15*p+1)/2), [seq(i, i=3..10000, 2)]);
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MATHEMATICA
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Select[Prime[Range[300]], PrimeQ[(15#+1)/2]&] (* Harvey P. Dale, Sep 20 2017 *)
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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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