Function pmd 

pub fn pmd(n: u64) -> u64

Returns divisor of number that consists only of multiplication or power expressions in Algexenotation.

Addition in Algexenotation does not contribute to the divisor. Addition in the power, e.g. 2'^7' does not contribute, because 7' = (1+0^0) which uses addition.

There is an invariant pmd(a * b) = pmd(a) * pmd(b).

The name pmd stands for power-multiply-divisor.