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18 lines
321 B
Ruby
18 lines
321 B
Ruby
# The prime factors of 13195 are 5, 7, 13 and 29.
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# What is the largest prime factor of the number 600851475143 ?
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def solution(n)
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prime = 1
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i = 2
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while i * i <= n
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while (n % i).zero?
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prime = i
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n = n.fdiv i
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end
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i += 1
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end
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prime = n if n > 1
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prime.to_i
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end
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puts solution(600851475143)
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