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river24/prime_check.rb

Created May 9, 2014 22:30
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510から531までの素数を調べる
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prime_check.rb
require 'prime'
range = 510..531
range.each do |num|
if Prime.instance.prime?(num)
print "#{num} is a prime : "
else
print "#{num} is not a prime : "
end
factors = num.prime_division
p factors
end
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