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A110285
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Numbers n such that n*10^n + n - 1 is prime.
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0
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OFFSET
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1,1
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COMMENTS
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Not proved, only Fermat and Lucas PRPs. Next term is greater than 12000. Concerning primes of the form n * 10^n + n + 1, only n=42 yields one for all n up to 7700.
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LINKS
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PROG
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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STATUS
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approved
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