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.
Back to basics 22 - Rotate a matrix
Sum of first n terms of a harmonic progression
Count up then down
convert matrix to single column
Unique dice configurations
Pandigital Multiples of 11 (based on Project Euler 491)
Return elements unique to either input
Fun with a compass
Give me Hamming on five, hold the mayo
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