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A046419
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Repunit of length a(n) has exactly 8 prime factors (counted with multiplicity).
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2
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28, 51, 55, 58, 77, 86, 95, 98, 107, 115, 119, 124, 155, 161, 193, 209, 217, 218, 221, 233, 253, 265, 295, 298, 303, 314, 346
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, Repunit
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MATHEMATICA
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Select[Range[320], PrimeOmega[FromDigits[Table[1, #]]]==8&] (* Harvey P. Dale, Sep 04 2018 *)
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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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Offset changed to 1, a(23)-a(26) added by Ray Chandler, Apr 23 2017
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STATUS
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approved
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