test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Most nonzero elements in row
give nth decimal place of pi
Find number of days
Find Factrorial without using built-in function
Sum of diagonals elements of a matrix
Tony's trick for duplicating an mx1 vector n times
Magic Concentric Circles
Convert vector datasets to plot with imagesc instead of scatter
Strange Number Algorithms
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