This is a one-liner if you have a function that can identify primes.

Project Euler problem number 10 - Summation of primes - is stated as follows. The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million.

```
#![feature(iterator_step_by)]
fn is_prime(n: u64) -> bool {
if n == 2 || n == 3 {
return true;
} else if (n < 2) || (n % 2 == 0) {
return false;
}
let upper_limit = (n as f64).sqrt() as u64;
(3..upper_limit + 1)
.step_by(2)
.find(|i| n % i == 0)
.is_none()
}
fn sum_primes_below(n: u64) -> u64 {
(0..n).filter(|x| is_prime(*x)).sum()
}
fn main() {
let n = 2_000_000;
let sum = sum_primes_below(n);
println!("The Sum of the first {} primes is {}.", n, sum);
}
```

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