### Topic: 10001st prime

### Problem Statement:

By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.

What is the 10 001st prime number?

You can find the original question here -> Project Euler

## Check for Armstrong Number

### Deepak Raj γ» Jul 31 '20 γ» 1 min read

### 10001st prime - Project Euler Solution in Python

```
import itertools
def is_prime(n):
for i in range(2, n//2 + 1):
if n % i == 0:
return False
else:
continue
return True
p = 0
for x in itertools.count(1):
if is_prime(x):
if p == 10001:
print(x)
break
p += 1
```

Share Your Solutions for 10001st prime

## Top comments (7)

Using the Python extensible prime generator: "Iterative sieve on unbounded count from 2" function

`prime_sieve`

as posted on Rosetta Code.Modified to test less primes:

Reuse the smaller primes we found and only try divisions by them instead of every number. Also technically we only need to try up to

`sqrt(n)`

which is usually less than`n//2 + 1`

.It can save time and space complexity.

Thatβs a quite slow algorithm. I suggest to look at sieve of atkin.

Thanks for suggesting.

Trying upto 10001 is not a good idea. And if the constraints go up you might even face TLE. Why don't use sieve?