Not really my solution... just a slightly cheating version of @bmtran's.
Project Euler: Problem 7, Nth prime
Find perfect placement of non-rotating dominoes (easier)
Getting logical indexes
Find a subset that divides the vector into equal halves
Convert a structure into a string
2 b | ~ 2 b
Better bullseye matrix
Back to basics 22 - Rotate a matrix
Back to basics 19 - character types
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