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Search: id:A128335
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| A128335 |
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Numbers n such that (4^n + 5^n)/9 is prime. |
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21
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OFFSET
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1,1
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COMMENT
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All terms are primes.
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MATHEMATICA
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k=4; 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. A057171, A082387, A122853, A128336, A128337, A128338, A128339, A128340, A128341, A128342, A128343. Cf. A004061, A082182, A121877, A059802. Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
Sequence in context: A094963 A045446 A106074 this_sequence A023246 A022889 A001562
Adjacent sequences: A128332 A128333 A128334 this_sequence A128336 A128337 A128338
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KEYWORD
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hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 27 2007
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EXTENSIONS
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3 more terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Feb 06 2008
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