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.
Reindex a vector
Replace Vector Elements
Create an n-by-n null matrix and fill with ones certain positions
Recaman Sequence - I
With apologies to William Blake
Must be in the front row...
If you prick us, do we not bleed?
Pandigital Multiples of 11 (based on Project Euler 491)
Go to the head of the class!
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