Arithmetic/Rational: Difference between revisions
→{{header|Ruby}}: Speed up by using Integer.sqrt
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(→{{header|Ruby}}: Speed up by using Integer.sqrt) |
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=={{header|Ruby}}==
Ruby has a Rational class in it's core since 1.9.
<lang ruby>
for candidate in 2 .. 2**19
sum = Rational(1, candidate)
for factor in 2 .. Integer.
if candidate % factor == 0
sum += Rational(1, factor) + Rational(1, candidate / factor)
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