Cannot reproduce this result. (either because it is wrong, or because I was doing something wrong), I asked myself whether it is easy to write a small program that takes all the constants and the given number and permutes it with possible operators (* / - + exp (..)), etc.) until a result is found.
Permutations of n different objects with a valid repetition are n ^ r. At least while I'm small, I think you should do it. Interestingly, someone did something similar here.
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