Add sprime.cpp. isPrime[100000000] is too big. Not AC. Changing to isPrime[10000] is also slow
To get N super primes, start from (N-1) super primes.
Add pprime.cpp. First get a palindrome, then check if it's a prime. Let's generate all the pprime in [1, 100,000,000], then output those in [a, b].