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The Sieve of Eratosthenes in Javascript
function erato(n){
let map = new Map((new Array(n-1).fill(1)).map((n,i)=>[i+2,true]));
for (let i = 2; i <= Math.sqrt(n);i++){
if (!map.get(i)) continue
for (let j = i*2; j <= n; j += i) map.set(j,false)
return Array.from(map).filter(([n,b])=>b).map(([n])=>n);
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