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hyuki0000/prime.rb

Created April 24, 2017 02:12
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円周率のような数字列を頭から見て素数を探す
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prime.rb
#!/usr/bin/env ruby
require 'prime'
s = "31415926535"
s.length.times do |k|
t = s[0..k].to_i
if t.prime?
puts "#{t} is prime."
else
puts "#{t} is not prime."
end
end
@hyuki0000
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3 is prime.
31 is prime.
314 is not prime.
3141 is not prime.
31415 is not prime.
314159 is prime.
3141592 is not prime.
31415926 is not prime.
314159265 is not prime.
3141592653 is not prime.
31415926535 is not prime.

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