test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Prime factor digits
Back to basics 1 - Saving
Whether the input is vector?
Reindex a vector
ベクトル [1 2 3 4 5 6 7 8 9 10] の作成
Strange Number Algorithms
Is this number Munchhausen Narcissistic?
Magic Concentric Circles
Tony's trick for duplicating an mx1 vector n times
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