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A122853
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Numbers n such that (3^n + 5^n)/8 = A074606(n)/8 is a prime.
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29
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OFFSET
| 1,1
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COMMENTS
| (3^n + 5^n)/8 = A074606(n)/8 = A081186(n)/4.
Corresponding primes of the form (3^n + 5^n)/2^3 are listed in A121938(n) = A079773(a(n)) = {19,421,10039,95383574161,2384331073699,...}.
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MATHEMATICA
| Do[f=5^n+3^n; If[PrimeQ[f/2^3], Print[{n, f/2^3}]], {n, 1, 1231}]
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PROG
| (PARI) select(n->isprime((3^n + 5^n)/8), vector(2000, i, i)) \\ Charles R Greathouse IV, Feb 13 2011
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CROSSREFS
| Cf. A074606, A081186, A121824, A121877, A005058, A005059, A121938, A109347, A079773.
Sequence in context: A087126 A062547 A125739 * A137258 A053341 A086086
Adjacent sequences: A122850 A122851 A122852 * A122854 A122855 A122856
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KEYWORD
| more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Sep 14 2006
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