"...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!?!
Sum all integers from 1 to 2^n
matrix of natural number
Spot the First Occurrence of 5
Increasing sub-sequence (Level 1)
Sorting integers by their digits (Level 1)
Mean number of letters per word (Easy)
Factorizing a number into a given number of factors
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