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 palindrome
Numbers with prime factors 2, 3 and 5.
"Look and say" sequence
Replace Vector Elements
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
It's going down. We're finding simbers!
Golomb's self-describing sequence (based on Euler 341)
Don't be mean. Be nice!
Give me Hamming on five, hold the mayo
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