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Here is a little puzzle called "Tetractys Puzzle" important to followers of Pythagoras called Pythagoreans.
The Tetractys (pronounced "tet-trak'tis") is a triangular figure consisting of ten vertices arranged in four rows: one, two, three, and four dots in each row. It was a mystical symbol to the Pythagoreans, who lived during the 6th century B.C.
Can you find the number of primes in the diagram representing Tetractys arrangement by reading forwards or backwards along the indicated lines?