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Search: id:A109887
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| A109887 |
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Numbers n such that 3^n + phi(n) is prime. |
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+0
1
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OFFSET
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1,1
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COMMENT
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All terms correspond to certified primes (Primo 2.2.0 beta). No more terms through 10000.
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MATHEMATICA
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Do[If[PrimeQ[3^n + EulerPhi[n]], Print[n]], {n, 1, 10000}]
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CROSSREFS
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Sequence in context: A006490 A139797 A036649 this_sequence A103038 A143108 A014009
Adjacent sequences: A109884 A109885 A109886 this_sequence A109888 A109889 A109890
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KEYWORD
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hard,nonn
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AUTHOR
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Ryan Propper (rpropper(AT)stanford.edu), Aug 31 2005
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