Science Fair Project Encyclopedia
Every hexagonal number is a triangular number, but not every triangular number is a hexagonal number. Like a triangular number, the digital root in base 10 of a hexagonal number can only be 1, 3, 6, or 9.
Hexagonal numbers should not be confused with centered hexagonal numbers, which model the standard packaging of Vienna sausages . To avoid ambiguity, hexagonal numbers are sometimes called "cornered hexagonal numbers".
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