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A046867
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Numbers n such that 10*11^n -1 is prime.
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10
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OFFSET
| 1,2
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REFERENCES
| 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
| Do[ If[ PrimeQ[10*11^n - 1], Print[n]], {n, 1, 2000}]
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CROSSREFS
| Cf. A003307, A002235, A046865, A079906, A046866, A001771, A005541, A056725, A079907.
Sequence in context: A030460 A163156 A041067 * A154823 A109835 A066364
Adjacent sequences: A046864 A046865 A046866 * A046868 A046869 A046870
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KEYWORD
| nonn,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| One more term from Robert G. Wilson (rgwv(AT)rgwv.com), Jan 16 2003
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