/Python/Determine if number is prime python

Determine if number is prime python

# Time Efficient Primality Check in Python

def primeCheck(n):
    # 0, 1, even numbers greater than 2 are NOT PRIME
    if n==1 or n==0 or (n % 2 == 0 and n > 2):
        return "Not prime"
    else:
        # Not prime if divisable by another number less
        # or equal to the square root of itself.
        # n**(1/2) returns square root of n
        for i in range(3, int(n**(1/2))+1, 2):
            if n%i == 0:
                return "Not prime"
        return "Prime"

Check for prime in python

def is_prime(n: int) -> bool:
    """Primality test using 6k+-1 optimization."""
    import math
    if n <= 3:
        return n > 1
    if n % 2 == 0 or n % 3 == 0:
        return False
    i = 5
    while i <= math.sqrt(n):
        if n % i == 0 or n % (i + 2) == 0:
            return False
        i += 6
    return True

Source: en.wikipedia.org

How to see if a number is prime in python

def is_prime(n: int) -> bool:
    """Primality test using 6k+-1 optimization."""
    if n <= 3:
        return n > 1
    if n % 2 == 0 or n % 3 == 0:
        return False
    i = 5
    while i ** 2 <= n:
        if n % i == 0 or n % (i + 2) == 0:
            return False
        i += 6
    return True

Source: en.wikipedia.org

Similar codes

2 votes143 views1 answer
How to make a letter animation in python
Python
0 vote134 views1 answer
Shared SHMEM python
Python
0 vote146 views1 answer
'NoneType' object has no attribute 'isnull'
Python
5 votes183 views4 answers
Python debugger
Python
1 vote161 views1 answer
Panda Series Function
Python
11 votes188 views2 answers
How to find the position in a list python
Python
0 vote118 views1 answer
Python ctypes maximize window
Python
0 vote169 views1 answer
KivyMD video recording
Python
0 vote152 views3 answers
Python thread exception
Python
-1 vote188 views9 answers
Django for Beginners
Python Django