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Twenty-one is a triangular number — the sum of the first six counting numbers (1 + 2 + 3 + 4 + 5 + 6 = 21), which is also why a standard die has its faces total 21. 21 is a Fibonacci number, sitting in the famous sequence (..., 8, 13, 21, 34, ...), and it's one of the rare numbers that is both triangular and Fibonacci. Twenty-one is the ...
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