you must decide how the input variable is named: 'n', 'nx' or 'x'!! :-/
I cleaned things up a little.
Hard-coded solutions based on look-up tables for F_n or (F_n)², such as Solution 1506329, should be banned and failed by the Test Suite.
I do not undertand the problem. If you provide the fibonacci sequence, there is nothing to do.
Finding Perfect Squares
Find the sum of the elements in the "second" diagonal
Replace multiples of 5 with NaN
Basic arrays operations.
Rotate Matrix @180 degree
Convert a number to its Roman representation
Concatenate two strings
Reverse a matrix
Find the square of the sum of the digits of a number
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