r=arr.filter( function (element) { let sum=0; for (let i=1;i<=element;i++) { if (!(element % i)) { sum++ ; } } return sum===2; }) return r;
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r=arr.filter( function (element) { let sum=0; for (let i=1;i<=element;i++) { if (!(element % i)) { sum++ ; } } return sum===2; }) return r;