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// https://projecteuler.net/problem=3

export const largestPrime = (num = 600851475143) => {

let newnum = num

let largestFact = 0

let counter = 2

while (counter * counter <= newnum) {

if (newnum % counter === 0) {

newnum = newnum / counter

} else {

counter++

}

}

if (newnum > largestFact) {

largestFact = newnum

}

return largestFact

}