I'm trying to understand what mod means in this equation and how to solve it:
d * 13 = 1 mod 1680
This is from how to make a public and private key pair. The answer is 517 apparently and I can get that from wolfram. I assume mod is %, but that doesn't seem to work out. I've also seen that this could me mod( 1, 1680 ) which supposedly equals
mod( m, n ) = m - n ( m / n )
But for that I get 1 and then 1 / 13 is obviously not 517. Just looking for some direction. Thanks.
Ha, I know so little that I can't even find a tag to add.