RubyでGoogleの問題を解く - Qiita

def getNums() line = readlines len = line.length num = '' (0..len-1).each do |i| num = num + line[i].chomp end return num end def prime?(num) (2..Math.sqrt(num).to_i).each do |i| if(num%i == 0) return false end end return true end digits = 10 if $PROGRAM_NAME == __FILE__ num = getNums().delete('.') res = 0 (0..num.length-digits).each do |i| res = num[i, digits].to_i prime?(res) ? break : next end