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Recent snippets matching tags of prime numbers
bool isPrimef(int n){ if (n == 1 ) return false; if (n < 4 ) return true; if (n % 2 == 0) return false; if (n < 9 ) return true; if (n % 3 == 0) return false; else{ int r = std::sqrt(n); int f = 5; while (f <= r){
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