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Search: id:A046867
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| A046867 |
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Numbers n such that 10*11^n -1 is prime. |
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+0
10
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OFFSET
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1,2
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REFERENCES
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R. K. Guy, Unsolved Problems in Theory of Numbers, Section A3.
H. C. Williams, The primality of certain integers of the form 2Ar^n - 1, Acta Arith. 39 (1981), 7-17.
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MATHEMATICA
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Do[ If[ PrimeQ[10*11^n - 1], Print[n]], {n, 1, 2000}]
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CROSSREFS
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Cf. A003307, A002235, A046865, A079906, A046866, A001771, A005541, A056725, A079907.
Adjacent sequences: A046864 A046865 A046866 this_sequence A046868 A046869 A046870
Sequence in context: A031919 A030460 A041067 this_sequence A109835 A066364 A106995
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KEYWORD
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nonn,hard
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AUTHOR
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njas
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EXTENSIONS
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One more term from Robert G. Wilson (rgwv(AT)rgwv.com), Jan 16 2003
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