Thread: theory on Mersenne primes ? View Single Post
2010-11-12, 20:44   #50
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

100000110000002 Posts

Quote:
 Originally Posted by axn See the highlighted part. That is the correct relation. This follows from the fact that sumdigits(x) is equivalent to x%9.
it works for addition for sumdigits(x*y)=4 lol