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 A128354 Numbers n such that (19^n - 5^n)/14 is prime. 19
 5, 17, 31, 59, 373, 643, 2843, 5209, 85009 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are primes. a(10) > 10^5. - Robert Price, Jul 22 2013 LINKS MATHEMATICA k=19; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n, 1, 100}] PROG (PARI) is(n)=isprime((19^n-5^n)/14) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353. Cf. A004061, A082182, A121877, A059802. Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128340, A128341, A128342. Sequence in context: A031370 A147434 A147336 * A078654 A083364 A273499 Adjacent sequences:  A128351 A128352 A128353 * A128355 A128356 A128357 KEYWORD hard,more,nonn AUTHOR Alexander Adamchuk, Feb 27 2007 EXTENSIONS a(7)-a(9) from Robert Price, Jul 22 2013 STATUS approved

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Last modified May 24 20:53 EDT 2019. Contains 323534 sequences. (Running on oeis4.)