This road sign is on CA Hwy-78 in California.

The road sign says...

+----------------------+ | Ocotillo Wells 22 | | Junction 86 39 | | Brawley 62 | +----------------------+To date, MathBabbler has not found any math in this road sign; therefore, he resorted to using the

spf(n)function to morph numbers. [The spf(n) function outputs the sum of the prime factors for the input.]the numbers are: 22 39 62 86 the math is: 86 - 22 - 62 = sqrt(sqrt(spf(39))) observe... 86 - 22 = 64 64 - 62 = 2 spf(39) = 3 + 13 = 16 sqrt(16) = 4 sqrt(4) = 2All four numbers found in this road sign each have only two prime factors.

prime_factors(22) = 2 * 11 prime_factors(39) = 3 * 13 prime_factors(62) = 2 * 31 prime_factors(86) = 2 * 43 using the smallest prime factors for each number on the left-side of the equation and the largest prime factors for each number on the right-side of the equation... 2 * 3 * 2 * 2 = (13 - 11) * (43 - 31)

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

**Created:** 21 December 2007

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