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).
Finding Perfect Squares
Filter AC, pass DC
Construct a string from letters and counts
Find number of days
Find a Pythagorean triple
Maximum of ND-array
Iterative sum of digits of 2^n number
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