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.
Project Euler: Problem 10, Sum of Primes
Solve the set of simultaneous linear equations
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Make a vector of prime numbers
Return elements unique to either input
With apologies to William Blake
How brilliant are you?
It's going down. We're finding simbers!
Kurchan 4x4 - Optimal score
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