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A128352
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Numbers n such that (17^n - 5^n)/12 is prime.
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18
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OFFSET
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1,1
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COMMENTS
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All terms are primes.
a(10) > 10^5. - Robert Price, Jun 11 2013
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LINKS
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Table of n, a(n) for n=1..9.
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MATHEMATICA
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k=17; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n, 1, 100}]
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CROSSREFS
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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: A214345 A166109 A157755 * A025085 A175238 A032412
Adjacent sequences: A128349 A128350 A128351 * A128353 A128354 A128355
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KEYWORD
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nonn,hard,more,changed
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AUTHOR
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Alexander Adamchuk, Feb 27 2007
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STATUS
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approved
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