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A128336
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Numbers n such that (6^n + 5^n)/11 is prime.
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19
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OFFSET
| 1,1
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COMMENTS
| All terms are primes.
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MATHEMATICA
| k=6; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n, 1, 100}]
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PROG
| (PARI) forprime(p=3, 1e4, if(ispseudoprime((6^p+5^p)/11), print1(p", "))) \\ Charles R Greathouse IV, Jul 16, 2011
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CROSSREFS
| Cf. A057171, A082387, A122853, A128335, A128337, A128338, A128339, A128340, A128341, A128342, A128343, A004061, A082182, A121877, A059802, A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
Sequence in context: A000215 A123599 A016045 * A094487 A007516 A039584
Adjacent sequences: A128333 A128334 A128335 * A128337 A128338 A128339
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 27 2007
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EXTENSIONS
| a(7)-a(9) from Alexander Adamchuk (alex(AT)kolmogorov.com), May 04 2010
One more term (8783) added (unknown discoverer) corresponding to a probable prime with 6834 digits. Jean-Louis Charton (chartonjl(AT)wanadoo.fr), Oct 06 2010
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