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.
Which values occur exactly three times?
Flip the main diagonal of a matrix
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Create an n-by-n null matrix and fill with ones certain positions
Should Mr McNugget even get out of bed today?
Pandigital Multiples of 11 (based on Project Euler 491)
Two fractions, one sum
Community Problem 500!
A matrix of extroverts
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