Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are lower or equal to n (i,j,k integers).
It dseon't mettar waht oedrr the lrettes in a wrod are.
Find perfect placement of non-rotating dominoes (easier)
Make a run-length companion vector
intersection of matrices
Iterative sum of digits of 2^n number
Maximum of ND-array
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