This road sign is on northbound AZ Hwy-87 in Arizona.

The road sign says...

+---------------+ | Pine 13 | | Cottonwood 70 | | Winslow 88 | +---------------+MathBabbler was not able to find an equation using the numbers in the sign; therefore, he resorted to using some of his BARS functions.

str_to_nbr(s) converts string 's' into the digits MathBabbler must press on his cell phone in order to send 's' as a text message; the function outputs the sum of the digits mult_digits(n) outputs the product of the digits found in prime number 'n'; the function's domain is all prime numbers sum_prime_factors(n) outputs the sum of the prime factors for 'n'the numbers are: 13 70 88 str_to_nbr("pine") = 74446633 (sum = 37) str_to_nbr("cottonwood") = 222666886666696666663 (sum = 118) str_to_nbr("winslow") = 94446677775556669 (sum = 124) existing numbers equals derived numbers math: 88 - 70 + 13 = 37 - (124 - 118) 37 - 13 = 24 118 - 70 = 48 124 - 88 = 36 average math: avg(24, 48) = 36 sum_prime_factors(88) - sum_prime_factors(70) = mult_digits(13) observe... prime factors for 88 are: 2 * 2 * 2 * 11 (sum = 17) prime factors for 70 are: 2 * 5 * 7 (sum = 14)

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 31 May 2008 (posted 1 June 2008)

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