25 lines
408 B
Ruby
25 lines
408 B
Ruby
# A palindromic number reads the same both ways. The largest palindrome made from the
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# product of two 2-digit numbers is 9009 = 91 × 99.
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# Find the largest palindrome made from the product of two 3-digit numbers.
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x = 0
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b = 100
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y = []
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while b < 1000
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a = 100
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while a < 1000
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x = a * b
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x = x.to_s
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if x == x.reverse
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y << x.to_i
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end
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a += 1
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end
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b += 1
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end
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puts y.sort.max
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