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A121938
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Primes of the form (3^n + 5^n)/2^3 = A074606(n)/8.
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2
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OFFSET
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1,1
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COMMENTS
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Corresponding numbers n such that (3^n + 5^n)/8 is prime are listed in A122853. All these numbers are primes. - Alexander Adamchuk, Sep 14 2006
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LINKS
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FORMULA
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MATHEMATICA
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Do[f=5^n+3^n; If[PrimeQ[f/2^3], Print[{n, f/2^3}]], {n, 1, 1231}] (* Alexander Adamchuk, Sep 14 2006 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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