This road sign is on southbound I-17 nine miles north of the Sunset Point Rest Area in Arizona. [Note: The picture of the road sign was taken from a Greyhound bus.]

The road sign says...

+-------------------------+ | Rest Area 9 | | Black Canyon City 19 | | Phoenix 63 | +-------------------------+the numbers are: 9 19 63 the math is: 63 % 19 = sqrt(9)! rsAgeEval: 63 - 19 + 9 = 53 * RoadHacker was 53 years young when he found this road sign. off-by-one rs42Eval: 63 - 19 - sqrt(9) = 42-1 * 42 is the "Answer to Life, the Universe, and Everything" off-by-one rsStateEval: 63 - 19 + sqrt(9) = 48-1 * Arizona was the 48th state admitted to the Union. BARSfunc math: 19 - sqrt(9)! = spf(63) * spf(n) = the sum of the prime factors of n * spf(63) = 3+3+7 = 13 BARSfunc rsHwyEval: 19 - sqrt(spf(63) - 9)) = 17 * This road sign is on I-17. BARSfunc rsStateEval: 63_{9}- mult_digits(19) = 48 * Arizona was the 48th state admitted to the Union. * mult_digits(n) = product of the digits of n * domain: n must be a prime number * mult_digits(19) = 1*9 = 9

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

**Created:** 01 May 2011

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