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#include <bits/stdc++.h>
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using namespace std;
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// 1<><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20>ж<EFBFBD>n<EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
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bool is_prime(int n) {
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if (n < 2)
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return false;
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for (int i = 2; i < n; ++i)
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if (n % i == 0)
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return false;
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return true;
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}
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//2 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD><C5BB><EFBFBD><EFBFBD><EFBFBD>
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bool is_prime2(int n) {
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if (n < 2)
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return false;
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/**
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* ֻ<EFBFBD><EFBFBD>Ҫ<EFBFBD>жϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>n<EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫʹ<EFBFBD><EFBFBD>С<EFBFBD>ڵ<EFBFBD><EFBFBD>ڷ<EFBFBD><EFBFBD><EFBFBD>
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* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>С<EFBFBD>ڷ<EFBFBD><EFBFBD>ţ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>9<EFBFBD><EFBFBD>
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**/
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for (int i = 2; i * i <= n; ++i)
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if (n % i == 0)
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return false;
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return true;
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}
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int main() {
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for (int i = 2; i < 1000; i++) {
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cout << i << ":" << is_prime2(i) << endl;
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}
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return 0;
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}
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