ID 27: Updated function "isPrime".
ID 10: New answer based on refreshed ID 7.

ID 7 was refreshed at commit 6c1d455bc6f024691906484b12cab96891bbabd1,
which is more simpler, more faster prime number list.
New answer to ID 10 just sums prime numbers below 2 million of the list.
ID 35: Updated to prevent from redundant decision.
ID 35: Updated; No longer using set of primes.