BARS::US Hwy-136 Two Miles West of San Jose, Illinois

These road signs were found heading east on US Hwy-136 in Illinois. The road sign math was discovered while working on the final POTW for the Spring 2006 semester.

The signs say...

     +--------------+
     | San Jose   2 |
     | McLean    25 |
     +--------------+
   +--------+ +-------+
   |  East  | | Speed |
   | US 136 | | Limit |
   +--------+ |  55   |
              +-------+
   the numbers are:  2  25  55  136

   the math is:  sqrt(sqrt(136 - 55) - sqrt(25)) = 2

   observe...
      136 - 55 = 81
      sqrt(81) = 9 
      sqrt(25) = 5
      sqrt(9 - 5) = sqrt(4) = 2

   sum_prime_factors(55) = 16
   sum_prime_factors(136) = 23

   the numbers are:  2  25  16  23

   the math is:  sqrt(2 * sqrt(sqrt(16))) + 23 = 25

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 30 April 2006

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This work is licensed under a Creative Commons Attribution 3.0 United States License.