I get a MemoryError and I dont know what it means. help def

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151KB, 1293x457px

I get a MemoryError and I dont know what it means. help

def primes(n):
    n += 1
    sieve = [True] * n
    for i in range(3, int(n ** 0.5) + 1, 2):
        if sieve[i]:
            sieve[i * i::2 * i] = [False] * ((n - i * i - 1) // (2 * i) + 1)
    return [2] + [i for i in range(3, n, 2) if sieve[i]]

def backwardsPrime(start, n):
    primes1 = primes(n)
    primes2 = [int(str(i)[::-1]) for i in primes(max([int(str(i)[::-1]) for i in primes1]))]
    return [i for i in primes1 if i >= start and ((int(str(i)[::-1]) != i) and (i in primes2))]


print (backwardsPrime(700000008, 700000050))