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Update problem03.rb #4

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Update problem03.rb #4

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15 changes: 15 additions & 0 deletions problem03.rb
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
def smallest_prime_factor(num)
return 2 if num.even?
i = 3
while i <= num
return i if num%i==0
i += 2
end
end

def largest_prime_factor(num)
return num if smallest_prime_fasctor(num) == num
largest_prime_factor(num/smallest_prime_factor(num))
end

p largest_prime_factor(600851475143)