See Cleve Moler's implementation at http://blogs.mathworks.com/cleve/2013/09/02/the-lambert-w-function/
Sum of diagonal of a square matrix
Mysterious digits operation (easy)
Extra safe primes
Cosine effect in solar power towers
Wien's displacement law
Sum two real numbers
Compound interest - number e
Create an n-by-n null matrix and fill with ones certain positions
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