Python/maths/hardy_ramanujanalgo.py
Kamil 9bfc314e87
hardy_ramanujanalgo type annotation ()
* Replacing the generator with numpy vector operations from lu_decomposition.

* Revert "Replacing the generator with numpy vector operations from lu_decomposition."

This reverts commit ad217c6616.

* Added type annotation.
2023-10-05 08:39:29 -04:00

46 lines
1.0 KiB
Python

# This theorem states that the number of prime factors of n
# will be approximately log(log(n)) for most natural numbers n
import math
def exact_prime_factor_count(n: int) -> int:
"""
>>> exact_prime_factor_count(51242183)
3
"""
count = 0
if n % 2 == 0:
count += 1
while n % 2 == 0:
n = int(n / 2)
# the n input value must be odd so that
# we can skip one element (ie i += 2)
i = 3
while i <= int(math.sqrt(n)):
if n % i == 0:
count += 1
while n % i == 0:
n = int(n / i)
i = i + 2
# this condition checks the prime
# number n is greater than 2
if n > 2:
count += 1
return count
if __name__ == "__main__":
n = 51242183
print(f"The number of distinct prime factors is/are {exact_prime_factor_count(n)}")
print(f"The value of log(log(n)) is {math.log(math.log(n)):.4f}")
"""
The number of distinct prime factors is/are 3
The value of log(log(n)) is 2.8765
"""