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Numbers n k such that (7^n k + 5^nk)/12 is prime.
Cf. A057171, A082387, A122853, A128335, A128336, A128338, A128339, A128340, A128341, A128342, A128343. Cf. A004061, A082182, A121877, A059802. Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
Cf. A004061, A082182, A121877, A059802.
Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
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(PARI) is(n)=isprime((7^n+5^n)/12) \\ Charles R Greathouse IV, Feb 17 2017
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a(13) > 10^5 . - _Robert Price, _, Nov 20 2012
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a(13) ^ > 10^5 - Robert Price, Nov 20 2012
11, 31, 173, 271, 547, 1823, 2111, 5519, 7793, 22963, 41077, 49739
a(13) ^ 10^5 - Robert Price, Nov 20 2012
a(6)-a(12) from Robert Price, Nov 20 2012
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