Euler 77

I finished Euler 77 this morning. No great insights on this one; I basically just brute forced my way through the search space.

I am somewhat dissatisfied with my solution in that it essentially requires a guess at a value which the answer will be less than and, ideally, close to. I didn’t find an analytical way to find this value, but perhaps none exists (or none that is any faster than an iterative application of my solution.)

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