UNSOLVABLE? Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(micro)
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It's not really unsolvable. Actually, it's uniquely solvable it you have the right tool.
The word UNSOLVABLE stands for a 10-digit number. Each letter represents one digit. Do not assume that one letter is always the same digit. Do not assume that one digit is always the same letter. The cache is at N 42 UN.SOL W 73 VA.BLE. Here's what you need to know.
The set of primary residues begins with 1, 1, 3, 5, 6, 11, 11, 8, 10, 2, ...
So, what's UNSOLVABLE?
Additional Hints
(No hints available.)