I submitted one solution, and it did return the sum as a string, but complained of insufficient memory. Because of the order of operations, it was creating the n=12 array while evaluating n=11, and that array was apparently too large for Cody. Fixed now, but it is apparently going to be a problem for n=12 and above.
My code choked on n = 12 on my laptop. That was the motivation for the three optional tests, as well as for one of the tags.
Disallowing 'if' seems to disallow 'circshift' also, which I assume was not your intent.
Correct. I changed the test to look for 'if '.
Back to basics 23 - Triangular matrix
Longest run of consecutive numbers
Sophie Germain prime
Sum the elements in either diagonal of a square matrix
Basic arrays operations.
Solve the arithmetic differential equation D(n) = n
Compute the sum of reciprocals of quadratics
Solve the Challenger puzzle
Solve an ODE: diffusion problem 2
Evaluate the Struve function
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