"...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!?!
Return the 3n+1 sequence for n
Word Counting and Indexing
Return the Fibonacci Sequence
Getting the absolute index from a matrix
Mysterious digits operation (easy)
Number construction III
Increasing sub-sequence (Level 2)
The sliding puzzle: 3D
Optimally fill a container with elements of different sizes
Number construction II
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