OFFSET
1,1
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 1..6561
D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
EXAMPLE
11011*11011 = 11111*11111 = 111111111.
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved