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 15 - classes
Whether the input is vector?
Rotate a Matrix by 90 degrees
Oh Zero Zero Zero!!!
Digit concentration in Champernowne's constant
If you prick us, do we not bleed?
Highest powers in factorials
I've got the power! (Inspired by Project Euler problem 29)
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