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View sum_prime.rb
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#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'prime'
 
# 最初の1000個の素数の合計
puts Prime.each(nil, Prime::EratosthenesGenerator.new).each_with_index.inject(0) { |sum, (elem, index)|
break sum if index > 1000
sum += elem
}
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