The first test case is wrong 0 and 21 are triangular numbers too (https://oeis.org/A000217), therefore:
[ 0, 6;
PS: And 0 does not make a pair with every number in this case.
What's wrong with the case x=20 in test suite? Why is y_correct=[ 10 10] ? I cannot pass it.
I don't know why your cheat isn't working, but look closely at what numbers your "for n=1:N" loop generates for that case.
Determine Whether an array is empty
Check if number exists in vector
Sum the numbers on the main diagonal
convert matrix to single column
What digit is it?
S-T-R-E-T-C-H I-T O-U-T
Give me Hamming on five, hold the mayo
Highest powers in factorials
Pseudo Square Root (Inspired by Project Euler 266)
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