BARS::Identical Road Signs On I-17 in Arizona

These road signs were printed on the front-page of the Arizona Republic on 12 September 2013.

The road signs say...

   +-----------+ +-----------+
   |  Exit 298 | |  Exit 298 |
   | 179 North | | 179 North |
   |   Sedona  | |   Sedona  |
   |  1/4 Mile | |  1/4 Mile |
   +-----------+ +-----------+
   the numbers are:  298  179  (1/4)  298  179  (1/4)

   the math is:  (298 / 298 + 179 / 179) * (1/4) = sqrt(1/4)

   more math:  298 - 298 + 179 - 179 + 1/4 = 1/4

   ... BARS playground ...

   sum_digits(179) = 17
   * sum_digits(n) = sum the digits of n
   * domain:  n must be a prime number; 179 is prime

   mult_digits(179) = 63
   * mult_digits(n) = product of the digits of n
   * domain:  n must be a prime number; 179 is prime

   spf(298) = 2+149 = 151
   * spf(n) = the sum of the prime factors of n
   * domain:  n must be composite number; 298 is not prime

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 12 September 2013 (posted 14 September 2013)

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