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Search: id:A125957
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| A125957 |
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Numbers n such that (2^n + 11^n)/13 is prime. |
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2
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OFFSET
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1,1
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COMMENT
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All terms are primes. Corresponding primes of the form (2^n + 11^n)/13 are {103, 12391, 38880540653801911, ...}.
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MATHEMATICA
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Do[p=Prime[n]; f=(2^p+11^p)/13; If[PrimeQ[f], Print[{p, f}]], {n, 1, 100}]
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CROSSREFS
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Cf. A000978 = numbers n such that (2^n + 1)/3 is prime. Cf. A057469 = numbers n such that (2^n + 3^n)/5 is prime. Cf. A082387 = numbers n such that (2^n + 5^n)/7 is prime.
Sequence in context: A049540 A097144 A085749 this_sequence A137460 A102295 A102846
Adjacent sequences: A125954 A125955 A125956 this_sequence A125958 A125959 A125960
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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 06 2007
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EXTENSIONS
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2 more terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Feb 09 2008
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