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davidhellsing/prime.js

Created February 20, 2012 19:16
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Prime number tester
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prime.js
// Test if a number is Prime using a simple regex.
// Demo: http://jsfiddle.net/rJhpq/
function prime(n) {
return !/^1?$|^(11+?)\1+$/.test((function(n){s='';while(n--)s+='1';return s;}(n)));
}
​
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