test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Back and Forth Rows
Add two numbers
Derivative of polynomial
Find nth maximum
Side of a rhombus
Magic Concentric Circles
Is this number Munchhausen Narcissistic?
Strange Number Algorithms
Tony's trick for duplicating an mx1 vector n times
remove nans fast
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