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.
Find the numeric mean of the prime numbers in a matrix.
Remove the vowels
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Divide by 4
How brilliant are you?
Numbers in extended form
Some Assembly Required
"Find out the best cricket"
Decimation - Optimized for speed
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