Created
August 24, 2012 18:51
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Project Euler 35
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| require 'prime' | |
| p Prime.each(10**6).select{|a|(1..a.to_s.size-1).map{|b|a.to_s.scan(/.{#{b}}|.+\Z/)}.map{|b|b.push(b.shift).join.to_i}.select{|b|b.prime?.!}.empty?}.size # 55 |
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