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A171767
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Numbers n such that 10^n*(3+7*10^n)+7 is prime.
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0
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OFFSET
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1,2
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COMMENTS
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The value corresponding to n=7180 was certified a Fermat and Lucas PRP with WinPFGW and submitted to Lifchitz's Top PRPs database.
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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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