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A247153
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a(n) = smallest prime p for which cyclic digit shifts produce exactly n different primes, or 0 if no such p exists for n.
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3
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2, 13, 113, 1193, 11939, 193939, 17773937, 119139133, 111133719913, 111119917373, 111393733793, 1117739771979737
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OFFSET
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1,1
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COMMENTS
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a(n) is equal to the smallest n-digit non-repunit prime in A016114, unless no n-digit non-repunit prime exists in A016114. In that case, the number of digits of a(n), if it exists, must be > n.
Do we have leading digit of a(n) <= any digit from a(n)?
For n > 1, can a(n) contain a digit d with gcd(10, d) > 1? (End)
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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a(7)-a(8) from P. De Geest's website added by Felix Fröhlich, Nov 26 2014
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STATUS
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approved
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