OFFSET
1,1
COMMENTS
LINKS
Dario A. Alpern, Factorization using the Elliptic Curve Method.
Makoto Kamada, Factorizations of 11...11 (Repunit)
Eric Weisstein's World of Mathematics, Cyclic Number
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Reinhard Zumkeller, Jul 30 2003
EXTENSIONS
a(3) corrected, a(12)-a(42) added by Ray Chandler, Nov 16 2011
a(43)-a(51) from Max Alekseyev, May 13 2022
STATUS
approved