OFFSET
1,2
COMMENTS
No other terms below 10^15. - Max Alekseyev, Nov 06 2018
9909932321420413420533943 is a term. - Max Alekseyev, Jun 29 2011
MATHEMATICA
Join[{1, 3, 9}, Select[Range[2000000], PowerMod[13, #, #] == 10 &]] (* Robert Price, Apr 10 2020 *)
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Zak Seidov, Feb 19 2006
EXTENSIONS
More terms from Ryan Propper, Jun 12 2006
Terms 1,3,9 prepended and a(10)-a(11) added by Max Alekseyev, Jun 29 2011, Nov 06 2018
STATUS
approved