"...return a positive integer, y, which is the xth term ..." in de description.
I have a single line of code in my solution -- how is yours so small!?!
Which values occur exactly three times?
vectorization in N
Sum the Digits of a Number
Matrix rotation as per given angle
The sliding puzzle: 3D
Increasing sub-sequence (Level 2)
Number construction III
Segmented number sequence
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