@Cris Luengo, filter2 is not a toolbox function, (I am not aware if it was earlier or not) and should be allowed now.
Strictly incomprehensible for me.
Well done :!
Really nifty!! ;-)
Return the 3n+1 sequence for n
Poker Series 02: isQuads
Use of regexp
Pi Estimate 1
Detect a number and replace with two NaN's
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