/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

0 vote131 views1 answer
Python- find multiple values in a column
Python
6 votes124 views2 answers
Plt.imshow grayscale
Python
0 vote204 views1 answer
How to compare values in dictionary with same key python
Python
0 vote125 views1 answer
Scrapy access settings from spider
Python
0 vote121 views1 answer
No default language could be detected for django app
Python
0 vote124 views1 answer
Calculate iqr in python dataset example
Python
0 vote134 views1 answer
Format numbers in column to percentage in python
Python
0 vote148 views2 answers
Groupby fillna ffill
Python
0 vote130 views1 answer
How to set propee timeline in python
Python
0 vote88 views1 answer
Split string by delimiter string
Python