To determine the actual location of this cache, you'll need to do some math.
Find the smallest ten digit number that contains all the numbers 0-9 and is evenly divisible by every number from 1 to 18. Assign the first digit to A, the second digit to B and so forth so that the tenth digit is J.
The cache is at: N42 55.BFD W88 01.FAE
You are looking for a small camoed pill bottle. Please respect park hours. Good luck! Permission to place this cache has been granted by Brian Russart, Milwaukee County Parks Natural Areas Coordinator, permit #34.
You can check your answers for this puzzle on Geochecker.com.