confused

lpf.nim

discard """ proc createPrimeList(n: Natural): seq[int] =
    result = @[2]
    for i in 3..n:
        for x in result:
            if i mod x == 0:
                break
            else:
                result.add(i)
"""

proc isPrime(n: Natural): bool =
    for i in countup(2, n-1):
        if n mod i == 0:
            return false
    return true

proc createPrimeSeq(n: Natural): seq[int64] =
    result = @[2'i64]
    for i in 3..n:
        if isPrime(i):
            result.add(i)

const primes = createPrimeSeq(1000)
var 
    num = 600851475143
    res = 0

for i in primes:
    while num mod i == 0:
        num /= i
    if num == 0:
        res = i
        break

echo($res)