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main() { int n; int t; int c; int p; c = 0; n = 2; while (n < 1000) { t = 2; p = 1; while (t*t <= n) { if (n % t == 0) p = 0; t = t + 2; } if (p) { if (c % 10 == 0) if (c != 0) printf("\n"); printf("%4d ", n); c++; } n++; } printf("\n"); }