Created
March 27, 2016 06:23
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| require "Prime" | |
| def largest_prime_factor(n) | |
| return n if n.prime? | |
| Prime.each do |p| | |
| if n % p == 0 | |
| k = n.to_f/p.to_f | |
| if k.to_i.prime? | |
| return k.to_i | |
| else | |
| return largest_prime_factor(k.to_i) | |
| end | |
| end | |
| end | |
| end |
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