All odd numbers in x are added, while all even numers are subtracted from this.
x = [1 2 3 4 5];
y = +(1+3+5)-(2+4) = 3
Back to basics 21 - Matrix replicating
Set some matrix elements to zero
Output any real number that is neither positive nor negative
Sum all integers from 1 to 2^x
Sum the rows
Reduce the logic
Remove multiples of N
Count the numbers
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