View Compilation Error

0_0_32160074_20889.cpp: In function 'int main()':
0_0_32160074_20889.cpp:42:13: error: 'i' was not declared in this scope
         FOR(i, 2, sqrt(n) + 2) {
             ^
0_0_32160074_20889.cpp:42:30: error: 'FOR' was not declared in this scope
         FOR(i, 2, sqrt(n) + 2) {
                              ^