The Adventure Lab (AL) 'Prime Adventures' provides extra information and data that will make this puzzle easier to solve. The puzzle can be completed without this data; however, it is more challenging.
* This number has a unique feature amongst all prime numbers
All the answers to the question marks need to be put in ascending order. Label these A,B, C, D, E, F and G.
The coordinates for the cache are
S 35 (D-B+(Ax2)).((2xG)+(F+B)) E 149 ((E-C)/2).((G+C)x7)+(G+E))
Checksums: S 22 E 31