OFFSET
1,2
COMMENTS
The pair (m,n) is reflexive, i.e., when n=m, m=n.
In fact, for n = 12*i + j, with 0 <= i < 12; 0 <= j < 12, m = i + 12*j. - Lekraj Beedassy, Aug 09 2006
REFERENCES
A. P. Domoryad, Mathematical Games and Pastimes, Problem 15 pp. 242;289 Pergamon Press NY 1965.
Y. Perelman, Mathematics can be fun, pp. 236-8 Mir Moscow.
CROSSREFS
KEYWORD
fini,nonn
AUTHOR
Lekraj Beedassy, Aug 08 2006
STATUS
approved