Changed the list of primes to be int, since we only need the first 1000 prime numbers.
Changed the sum to be int since the sum of the first 1000 primes is smaller  then the MaxValue of an int.
Implemented solution for CodeEval's biggest prime palindrome under 1000 challenge
https://www.codeeval.com/open_challenges/3/
Implemented solution for CodeEval's N longest lines challenge
https://www.codeeval.com/open_challenges/2/