hahahaha I havent tried figure out the math but without picking a number I know what the next symbol will be.
Cheap trickery... Theres only a select few numbers that you can wind up with using that equation ( don't have the time to figure out all those numbers right now ) And the program just rotates the symbol associated with those select numbers every try so it looks as if it's guessing different numbers every time. Ex. the symbol associated with 0==the awnser