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- require 'prime'
- p Prime.each.lazy.select{|a|a>7&&(1...a.to_s.size).map{|b|[a.to_s[0,b],a.to_s.split(//).reverse.join[0,b].split(//).reverse.join]}.flatten.all?{|b|b.to_i.prime?}}.take(11).inject(:+)
- # 748317 (ruby2.0.0dev)
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