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.
The Goldbach Conjecture
Read a column of numbers and interpolate missing data
Replicate elements in vectors
Max index of 3D array
Make roundn function
It's going down. We're finding simbers!
Community Problem 500!
Highest powers in factorials
That's some divisor you've got there...
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