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A046867
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Numbers n such that 10*11^n -1 is prime.
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15
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1, 3, 37, 119, 255, 355, 371, 497, 1759, 34863, 50719, 147709
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OFFSET
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1,2
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COMMENTS
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REFERENCES
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R. K. Guy, Unsolved Problems in Theory of Numbers, Section A3.
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LINKS
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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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PROG
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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