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素数

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var a = [1, 2, 3, 4, 5];

function prime_number(arr){
    return arr.filter(function (x) {
        var k = Math.sqrt(x);
        for (var i = 2; i <= k; i++){
            if(x % i == 0){
                return false;
            }
        }
        return true;
    });
}

var b = prime_number(a);

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