This road sign is on westbound AZ Hwy-187 in Arizona.

The road sign says...

+----------------------+ | Casa Grande 14 | | Tucson 81 | +----------------------+the numbers are: 14 81 BARSfunc math: spf(14) = sqrt(81) * spf(n) = the sum of the prime factors of n * spf(14) = 2+7 = 9 BARSfunc math: sqrt(spf(14)) = 4throot(81) * 4throot(81) = 3 because 3^4 = 81 BARSfunc rsCardinality: sqrt(sqrt(81)) - log(spd(14)) = 2 * There are 2 numbers in this road sign. * spd(n) = the sum of the proper divisors of n domain: n must be a composite number * spd(14) = 1+2+7 = 10 off-by-one BARSfunc 42Eval: spd(81) + log(spd(14)) = 42-1 * 42 is the "Answer to Life, the Universe, and Everything" * spd(81) = 1+3+9+27 = 40## First Usage of the

spd(n)BARS FunctionThe

spd(n)function was added to the BARS function library on 22 November 2013. This was the first BARS to use thespd(n)function.

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

**Created:** 23 November 2013

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