Python | sympy.primepi() method

With the help of sympy.primepi() method, we can find the number of prime numbers less than or equal to a given number.

Syntax: primepi(n)

Parameter:
n – It denotes the number up to which the count of prime number is calculated.

Returns: Returns the number of prime numbers less than or equal to n.

Example #1:

# import primepi() method from sympy
from sympy import primepi

n = 10

# Use primepi() method
count_primes = primepi(n)

print("The number of prime numbers less than or equal to {} is {}".format(n, count_primes))

Output:

The number of prime numbers less than or equal to 10 is 4

Example #2:

# import primepi() method from sympy
from sympy import primepi

n = 150

# Use primepi() method
count_primes = primepi(n)

print("The number of prime numbers less than or equal to {} is {}".format(n, count_primes))

Output:

The number of prime numbers less than or equal to 150 is 35