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August 29, 2015 14:10
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prime num generator
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function exists(prev, num) { | |
return prev.indexOf(num) > -1; | |
} | |
function primeNumber(number, prev) { | |
var res = true; | |
for(var i = 2; i < Math.sqrt(number); i++) { | |
if((number % i) == 0) { | |
return false; | |
} else if(exists(prev, number)) { | |
return false; | |
} | |
} | |
return res; | |
} | |
function generatePrime(n) { | |
var prime = '' + n; | |
console.time('time') | |
for(var i = 1; i < n; i++) { | |
var j = 1; | |
while((!primeNumber(parseInt(prime[i-1] + j), prime)) && j < 9) { | |
j = j + 2; | |
} | |
prime = prime + j; | |
} | |
console.timeEnd('time') | |
return prime; | |
} |
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