Number of Digits in Two Integers and Their Multiplication
Xingbo WANG · Journal of Advances in Applied Mathematics · 2019
This paper first proves a formula that discloses the relationship between the number of digits in multiplication and its two divisors, then proves that the two divisors are of the equal length if the divisor-ratio generated from the bigger divisor divided by the small one is smaller than 10.Hence the paper shows that, all the RSA numbers must have two divisors of the equal length.