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#  Math

1.  Write a function that produces a list of the first `n`
    triangular numbers.  The `n`th triangular number is the sum
    of the first `n` positive integers.

1.  Using the program from the previous exercise, write a
    function that produces the first `n` tetrahedral numbers.
    The `n`th tetrahedral number is the sum of the first `n`
    triangular numbers.