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def is_prime(n) return false if n <= 1 2.upto(Math.sqrt(n).to_i) do |x| return false if n%x == 0 end true end arr = [] for i in 0..1000000 i_arr = i.to_s.split(//) if (is_prime(i) == true and is_prime(i_arr.reverse.join.to_i) == true) and i != i_arr.reverse.join.to_i arr << i puts i end end
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