[−][src]Function primal_check::as_prime_power
pub fn as_prime_power(x: u64) -> Option<(u64, u8)>
Return Some((p, k))
if x = p^k
for some prime p
and k >= 1
(that is, including when x
is itself a prime).
Returns None
if x
not a perfect power.
Examples
assert_eq!(primal::as_prime_power(2), Some((2, 1))); assert_eq!(primal::as_prime_power(4), Some((2, 2))); assert_eq!(primal::as_prime_power(8), Some((2, 3))); assert_eq!(primal::as_prime_power(1024), Some((2, 10))); assert_eq!(primal::as_prime_power(1000), None); assert_eq!(primal::as_prime_power(15), None);