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 A128352 Numbers k such that (17^k - 5^k)/12 is prime. 19
 5, 7, 17, 23, 43, 71, 239, 733, 1097 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are primes. a(10) > 10^5. - Robert Price, Jun 11 2013 LINKS Table of n, a(n) for n=1..9. MATHEMATICA k=17; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n, 1, 100}] PROG (PARI) is(n)=isprime((17^n-5^n)/12) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128353, A128354. Cf. A004061, A082182, A121877, A059802. Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342. Sequence in context: A166109 A157755 A265812 * A025085 A175238 A240030 Adjacent sequences: A128349 A128350 A128351 * A128353 A128354 A128355 KEYWORD nonn,hard,more AUTHOR Alexander Adamchuk, Feb 27 2007 STATUS approved

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)