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Search: id:A122853
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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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31
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OFFSET
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1,1
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COMMENT
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All a(n) are primes. (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)] = {19,421,10039,95383574161,2384331073699,1925929944387235853055979210606894889560480247048440342330377620014353281101,...}.
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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}]
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CROSSREFS
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Cf. A074606, A081186, A121824, A121877, A005058, A005059, A121938, A109347, A079773.
Sequence in context: A087126 A062547 A125739 this_sequence A137258 A053341 A086086
Adjacent sequences: A122850 A122851 A122852 this_sequence A122854 A122855 A122856
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KEYWORD
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more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Sep 14 2006
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