OFFSET
1,1
LINKS
P. De Geest, Repunits prime factors
Makoto Kamada, Factorizations of 11...11 (Repunit)
Eric Weisstein's World of Mathematics, Repunit
MATHEMATICA
Select[Range[320], PrimeOmega[FromDigits[Table[1, #]]]==8&] (* Harvey P. Dale, Sep 04 2018 *)
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Patrick De Geest, Jul 15 1998
EXTENSIONS
More terms from Robert Gerbicz, Nov 22 2010
Offset changed to 1, a(23)-a(26) added by Ray Chandler, Apr 23 2017
a(27) from Max Alekseyev, May 14 2022
STATUS
approved