17 May
2012
17 May
'12
5:02 p.m.
> I'm not sure how I'd go about computing
that number. "Lots", I'm sure
> of that much, but just how many strikes me as difficult to work out.
On Thu,
17 May 2012, Barry Callahan wrote:
http://en.wikipedia.org/wiki/Mathematics_of_Sudoku#Enumerating_Sudoku_solut…
> The number of ways of filling in a blank Sudoku grid was shown in May
> 2005 to be 6,670,903,752,021,072,936,960 (~6.67?10^21 )
EXCEPT that that apparently treats two "symmetrical" (any/all rotations,
etc.) ones as being distinct. There are about 3/10^7 different symmetry
permutations.
Does that reduce it to about 2 E 14
Burnside said 5E9