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A093165
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Primes of the form 70*R_n + 3, where R_n is the repunit (A002275) of length n.
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4
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OFFSET
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1,1
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COMMENTS
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Primes of the form (7*10^n - 43)/9. - Vincenzo Librandi, Nov 16 2010
The next term, a(9), has 264 digits. - Harvey P. Dale, Jul 19 2012
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LINKS
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Table of n, a(n) for n=1..8.
Makoto Kamada, Prime numbers of the form 77...773.
Index entries for primes involving repunits
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MATHEMATICA
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Select[Table[FromDigits[PadLeft[{3}, n, 7]], {n, 500}], PrimeQ] (* Harvey P. Dale, Jul 19 2012 *)
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CROSSREFS
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Cf. A056689 (corresponding n), A099420.
Sequence in context: A060883 A162601 A173807 * A189306 A012810 A020517
Adjacent sequences: A093162 A093163 A093164 * A093166 A093167 A093168
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KEYWORD
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nonn
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AUTHOR
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Rick L. Shepherd, Mar 26 2004
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STATUS
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approved
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