This road sign was seen while watching the Food Network's "The Great Food Truck Race."

The road sign says...

+------------------------+ | I-90 I-39 US Hwy-51 | | Rockford Chicago | +------------------------+the numbers are: 90 39 51 the math is: 90 = 39 + 51 rsCardinalityEval: gcf(90, 39, 51) = 3 * There are three numbers in this sign. rsPiRadiansEval: (90 + 39 + 51)° = Pi radians * 180 degrees = 3.14159265 radians BARSfunc rsDupEval: 90 % 39 = 51 - dup(39) * dup(n) = n domain: all real numbers * spf(n) = the sum of the prime factors of n domain: n must be a composite number * 90, 39, 51 are all composite numbers * spf(90) = 2+3+3+5 = 13 * spf(39) = 3+13 = 16 * spf(51) = 3+17 = 20 BARSfunc rs37Eval: 90 - 51 - sqrt(sqrt(spf(39))) = 37 * Whyrs37Eval? 37 Heaven @ http://thirty-seven.org BARSfunc rs42: 90 - 51 + sqrt(sqrt(spf(39))) = 42-1 * 42 is the "Answer to Life, the Universe, and Everything" BARSfunc off-by-one rsAgeEval: spf(90) + spf(39) + spf(51) = 58+1 * MathBabbler was 58 years young when he saw this sign. Note: MathBabbler was closer to 59 than 58.

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

**Created:** 16 February 2016

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