Problem 57730. Easy Sequences 97: One-line Code Challenge - Sequence with Constant Difference

While answering Problem #57725, I noticed a pattern that immediately led me to a solution, namely: the 4-th difference of the sequence is constant. In that problem's case the constant is 6:
diff(A,4) == [6 6 6 6 ...]
where A is the sequence.
Given an integer n and a vector V that enumerates the first k elements of A, write a function that outputs the n-th element of A, such that the -th difference is a constant:
diff(A,k-1) == [c c c c ...]
-------------
NOTE: The following restrictions apply:
  • The function should only have one (1) line of code, excluding the function start line.
  • Semicolons (;) are considered end-of-line characters.
  • To encourage vectorization, for and while loops are not allowed
  • Regular expressions, string manipulation and curve fitting are not allowed.
Solve

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50.0% Correct | 50.0% Incorrect
Last Solution submitted on Apr 29, 2023

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