This muralized road sign is in Kingman, Arizona. RoadHacker found it on Pi Day 2017. {the mural}

```   +------------------------+
| Oatman              28 |
| Keepers of the Wild 30 |
| London Bridge       60 |
| G.C. Caverns        65 |
| G.C. West           71 |
| Hoover Dam          73 |
| G.C. Nat. Park     170 |
+------------------------+
```
```   the numbers are:  28  30  60  65  71  73  170

the math is:  170 - 65 * (60 / 30) - 28 = sqrt(71 + 73)

more math:  60 - 30 - cuberoot(73 - 65) = 170 % 71

rsPhiEval:  ((30 % (73 - 71))! + sqrt(65 - 60)) / (170 % 28) = Phi
* Phi is the golden ratio and it approximates 1.61803399

off-by-one math:  (65 - 60)^(30 - 28) + 73 + 71 = 170 - 1

off-by-one rsAgeEval:  170 / (65 - 60) + ((30 - 28) + (73 - 71))! = 59-1
off-by-one rsAgeEval:  170 / (73 - 71) - (65 - 60)^(30 - 28) = 59+1
* RoadHacker was 59 years young when he found this muralized road sign.

...playground...

170 % 73 = 24; 170 % 71 = 28; 170 % 65 = 40
170 % 60 = 50; 170 % 30 = 20; 170 % 28 = 2
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 17 April 2017