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# PrimePy module in Python

• Last Updated : 05 Aug, 2021

A prime number is a natural number greater than 1 whose only factors are 1 and the number itself. 2 is the only even Prime number. We can represent any prime number with ‘6n+1’ or ‘6n-1’ (except 2 and 3) where n is a natural number.

primePy is that library of Python which is used to compute operations related to prime numbers. It will perform all the functions in less time with the help of the functions of this primePy module.

## Installing Library

This module does not come built-in with Python. You need to install it externally. To install this module type the below command in the terminal.

` pip install primePy  `

## Functions of primePy

1. primes.check(n): It will return True if ‘n’ is a prime number otherwise it will return False.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `print``(primes.check(``105``))``print``(primes.check(``71``))`

Output:

```False
True```

2. primes.factor(n): It will return the lowest prime factor of ‘n’.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.factor(``15``)``print``(a)` `a ``=` `primes.factor(``75689456252``)``print``(a)`

Output:

```3
2```

3. primes.factors(n): It will return all the prime factors of ‘n’ with repetition of factors if exist.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.factors(``774177``)``print``(a)` `a ``=` `primes.factors(``15``)``print``(a)`

Output:

```[3, 151, 1709]
[3, 5]```

4. primes.first(n) : It will return first ‘n’ prime numbers.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.first(``5``)``print``(a)` `a ``=` `primes.first(``10``)``print``(a)`

Output:

```[2, 3, 5, 7, 11]
[2, 3, 5, 7, 11, 13, 17, 19, 23, 29]```

5. primes.upto(n): It will return all the prime numbers less than or equal to ‘n’.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.upto(``17``)``print``(a)` `a ``=` `primes.upto(``100``)``print``(a)`

Output:

[2, 3, 5, 7, 11, 13, 17]
[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]

6. primes.between(m, n): It will return all the prime numbers between m and n.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.between(``4``, ``15``)``print``(a)` `a ``=` `primes.between(``25``, ``75``)``print``(a)`

Output:

```[5, 7, 11, 13]
[29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73]```

7. primes.phi(n): It will return the number of integers less than ‘n’ which have no common factor with n.

Example:

## Python3

 `# Importing primes function``# From primePy Library``from` `primePy ``import` `primes`  `a ``=` `primes.phi(``5``)``print``(a)` `a ``=` `primes.phi(``10``)``print``(a)`

Output:

```4
4```

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