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#include <stdio.h> #define START 20000 #define END 40000 int isPrime(int n) { int i; for (i = 2; i < n / 2; i++) { if (n % i == 0) return 0; } return 1; } #define N 2 int is99(int n) { int m; m = 0; while (n > 0) { if (n % 10 == 9) m++; n = n / 10; } if (m == N) return 1; return 0; } int main() { int i; for (i = START; i <= END; i++) { if (!isPrime(i)) continue; if (!is99(i)) continue; printf("%d\n", i); } return 0; } /* end */
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