return arr.filter(function(x){ if(x===1){return false;} //if(x===2){return true;} for(let i=2;i<x;i++){ if(x%i===0){ return false;
} } return true; });
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捣麝成尘拗莲做寸
return arr.filter(function(x){ if(x===1){return false;} //if(x===2){return true;} for(let i=2;i<x;i++){ if(x%i===0){ return false;