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.
Bottles of beer
Back to basics 12 - Input Arguments
Calculate the area of a triangle between three points
Return a list sorted by number of consecutive occurrences
intersection of matrices
Pandigital Multiples of 11 (based on Project Euler 491)
Golomb's self-describing sequence (based on Euler 341)
With apologies to William Blake
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