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A092675
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Primes of the form 80*R_k + 1, where R_k is the repunit (A002275) of length k.
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2
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OFFSET
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1,1
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COMMENTS
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Primes of the form 888...881.
The number of 8's in each term is given by the corresponding term of A056664 and so the first term too large to include above is 888...8881 (with 138 8's).
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LINKS
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MATHEMATICA
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Select[Table[10 FromDigits[PadRight[{}, n, 8]]+1, {n, 150}], PrimeQ] (* Harvey P. Dale, Aug 07 2019 *)
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CROSSREFS
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KEYWORD
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bref,nonn
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AUTHOR
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STATUS
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approved
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