Statement

The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.

Find the sum of all the primes below two million.

Solution

In this case I use the Sieve of Eratosthenes to find the prime numbers
summing them up in the process.

if __name__ == '__main__':
    result = 0
    lst = list(range(2, 2000000))
    for i in range(0, len(lst)):
        interval = lst[i]
        if (interval != -1):
            result += interval
            j = i + interval
            while j < len(lst):
                lst[j] = -1
                j += interval
    print("The result is:", result)