Holy crap, it works for 12-16, too. Stopped checking after that.
9 stands by itself in the answer...add the rest of the numbers up and they come to 9.
the sum of the digits will be 9 or multiples of 9.
I’m just doing random numbers.
9 x 299 = 2691
9 x 1567 = 14103
9 x 1857922 = 16721298
problem is...I can’t stop...