Sum all integers from 1 to 2^n
Energy of a photon
Write a function man that takes a row vector v and returns a matrix H as follows..
The last non-zero digit of a factorial
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
Smallest n, for n! to have m trailing zero digits
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