# Python sympy | sieve.extend_to_no() method

With the help of sympy.sieve.extend_to_no() method, we can extend the sieve to include the ith prime number.
Note: The list is extended by 50% if it is too short, so it is likely that it will be longer than requested.

Syntax: sieve.extend_to_no(i)
Parameter:
i – It denotes that the sieve is extended to include the ith prime number.
Returns: The method does not return anything.

Example #1:

 `# import sympy  ` `from` `sympy ``import` `sieve ` ` `  `# Use sieve.extend_to_no() method  ` `sieve.extend_to_no(``15``)  ` `prime_list ``=` `sieve._list ` `     `  `print``(``"Prime Numbers up to 15th prime : {}"``.``format``(prime_list))   `

Output:

```Prime Numbers up to 15th prime : array('l', [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61])
```

Example #2:

 `# import sympy  ` `from` `sympy ``import` `sieve ` ` `  `# Use sieve.extend_to_no() method  ` `sieve.extend_to_no(``20``)  ` `prime_list ``=` `sieve._list ` `     `  `print``(``"Prime Numbers up to 15th prime : {}"``.``format``(prime_list))    `

Output:

```Prime Numbers up to 15th prime : array('l', [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89])
```

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