This road sign is on eastbound US Highway-136 in Illinois.

The road sign says...

+---------------+ | Havana 16 | | McLean 64 | +---------------+the numbers are: 16 64 the math is: sqrt(16) = cuberoot(64) more math: sqrt(sqrt(16)) = cuberoot(sqrt(64)) rsCardinalityEval: sqrt(64 / 16) = 2 number system rsCardinalityEval: log(64_{16}) = 2 * There are two numbers in this road sign. off-by-one rsStateEval: spf(16) + spf(64) = 21-1 * Illinois was the 21st state admitted to the Union. * spf(n) = the sum of the prime factors of n domain: n must be a composite number * 16 is composite; spf(16) = 2+2+2+2 = 8 * 64 is composite; spf(64) = 2+2+2+2+2+2 = 12

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

**Created:** 07 July 2016

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