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.
Which values occur exactly three times?
Whether the input is vector?
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Sum the Digits of a Number
Sum of the Matrix Elements
Sums of Distinct Powers
Muphry's Law of MATLAB
Piecewise linear interpolation
Matrix of Multiplication Facts
Pandigital Factors (Based on Euler 491)
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