ref: 4f18f449b7ddb35be623af059e5e8a570c60ed15
dir: /tests/0042-prime.c/
int main() { int n; int t; int c; int p; c = 0; n = 2; while (n < 5000) { t = 2; p = 1; while (t*t <= n) { if (n % t == 0) p = 0; t++; } n++; if (p) c++; } if (c != 669) return 1; return 0; }