Thanks, Neil! The first number has 22 digits, the second has 10 digits. It takes approx 9 digits to specify a mapping, leaving an additional 3 digits for various rotations, flips, permutations. These numbers jib with the minimal (?) number of clues: 17. These Sodokus (Sodoki?) will keep the local newspaper busy for the next 15 million years! At 05:17 PM 4/1/2006, N. J. A. Sloane wrote:
Henry, If you search under "sudoku" in the OEIS, you will find two relevant entries, as follows. Regards, Neil
%H A109741 Bertram Felgenhauer and Frazer Jarvis, <a href="http://www.shef.ac.uk/~pm1afj/sudoku/">There are 6670903752021072936960 Sudoku grids</a> %H A109741 J. P. Grossman, <a href="http://www.mathstat.dal.ca/~jpg/sudoku/">Javascript Sudoku solver</a> %H A109741 Ed Russell and Frazer Jarvis, <a href="http://www.shef.ac.uk/~pm1afj/sudoku/sudgroup.html">There are 5472730538 essentially different Sudoku grids</a>