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 and Forth Rows
Is my wife right?
Find nth maximum
Divisible by 5
Predicting life and death of a memory-less light bulb
Give me Hamming on five, hold the mayo
Longest run of consecutive numbers
What digit is it?
Pseudo Square Root (Inspired by Project Euler 266)
Some Assembly Required
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