### BARS::13 Miles From Yorkville, Illinois

This road sign is on westbound IL Hwy-126.

```   +--------------------+
| Route 71        11 |
| Yorkville       13 |
+--------------------+
```
```   the numbers are:  71  11  13

primeRS:  71, 11, 13 are all prime numbers; in addition,
71, 11, 13 are all reversible prime numbers
* reverse_digits(n) = the digits of n reversed
domain:  n must be a prime number
* reverse_digits(71) = 17; 17 is a prime number
* reverse_digits(11) = 11; 11 is a prime number
* reverse_digits(13) = 31; 31 is a prime number

rsCardinalityEval:  13 % (71 % 11) = 3
* There are three numbers in this road sign.

BARSfunc math:  13 - 11 = cuberoot(sum_digits(71))
* sum_digits(n) = sum the digits of n
domain:  n must be a prime number
* 71 is prime; sum_digit(71) = 7+1 = 8

BARSfunc math:  sum_digits(13) * sum_digits(11) = sum_digits(71)
* sum_digits(n) = sum the digits of n
domain:  n must be a prime number
* 13 is prime; sum_digits(13) = 1+3 = 4
* 11 is prime; sum_digits(11) = 1+2 = 2
* 71 is prime; sum_digit(71) = 7+1 = 8

BARSfunc rs37Eval:  reverse_digits(13) + reverse_digits(71) - 11 = 37
* Why 37? Just because.

BARSfunc rs42Eval:  sqrt(summation(11, 13)) * mult_digits(71) = 42
* 42 is the "Answer to Life, the Universe, and Everything"
* summation(11, 13) = 11+12+13 = 36
* mult_digits(n) = product of the digits of n
domain:  n must be a prime number
* 71 is prime; mult_digits(71) = 7*1 = 7

off-by-one BARSfunc rsStateEval:  13 + 11 - cuberoot(sum_digits(71)) = 21+1
* Illinois was the 21st state admitted to the Union.
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 27 June 2012