pub fn amicable_number(n: u64) -> bool
Return true if n is a member of an amicable pair,
that is, a pair of numbers whose aliquot sums equal
each other.
Panics if n is zero.
use reikna::aliquot::amicable_number;
assert_eq!(amicable_number(2620), true);
assert_eq!(amicable_number(2621), false);