### BARS::5 Miles From Terlingua in Southwest Texas

```   +--------------------------+
| Terlingua Ghost Town   5 |
| Lajitas               17 |
| Presidio              67 |
+--------------------------+
```
```   the numbers are:  5  17  67

primeRS:  all three numbers are prime numbers

rsHwyEval:  5! + 67 - 17 = 170
* This road sign is on TX Hwy-170.

rsCardinalityEval:  5 - sqrt(sqrt(67 % 17)) = 3
* There are three numbers in this road sign.

off-by-one math:  sqrt(67 % 17) = 5-1

... BARSfunctions having prime number domains ...

* reverse_digits(n) = the digits of n reversed
* mult_digits(n) = product of the digits of n
* sum_digits(n) = sum the digits of n

* 67 is prime; reverse_digits(67) = 76
sum_digits(67) = 6+7 = 13
mult_digits(67) = 6*7 = 42
* 17 is prime; reverse_digits(17) = 71
sum_digits(17) = 1+7 = 8
mult_digits(17) = 1*7 = 7

BARSfunc math:  reverse_digits(67) - reverse_digits(17) = 5
BARSfunc math:  sum_digits(67) - sum_digits(17) = 5
BARSfunc off-by-one math:  reverse_digits(17) - 67 = 5-1

BARSfunc rs42Eval:  sqrt(mult_digits(67)^(17 % 5)) = 42
* 42 is the "Answer to Life, the Universe, and Everything"

BARSfunc rsCardinalityEval:  cuberoot(67 - sum_digits(17) * 5) = 3
* There are three numbers in this road sign.
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 08 February 2016 