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A059671
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Numbers n such that n*10^n - 1 is prime.
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13
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2, 3, 8, 11, 15, 39, 60, 72, 77, 117, 183, 252, 396, 1745, 2843, 4665, 5364, 524427
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OFFSET
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1,1
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COMMENTS
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No further terms up to 500000 (see Harvey link). - Ray Chandler, Apr 10 2016
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 117, p. 41, Ellipses, Paris 2008.
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[ n*10^n - 1 ], Print[ n ] ], {n, 1, 2500} ]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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