OFFSET
1,1
LINKS
P. De Geest, Repunits prime factors
Makoto Kamada, Factorizations of 11...11 (Repunit)
Eric Weisstein's World of Mathematics, Repunit
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Patrick De Geest, Jul 15 1998
EXTENSIONS
More terms from Robert Gerbicz, Nov 22 2010
a(20) from Bo Gyu Jeong, Jun 30 2012
a(21)-a(22) from Ray Chandler, Apr 23 2017
STATUS
approved