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lune-sta/gist:3449539

Created August 24, 2012 11:37
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Project Euler 37
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gistfile1.rb
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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