Function names cannot begin with a number. Also, this is an extremely simple problem that has been posted many times. Please put more thought into problems before posting them.
I changed the problem slightly and added some more test cases.
Leading size is 0 !!!!!!!!!!!!
it's very easy
leading solution is zero ,what does this mean?
Project Euler: Problem 10, Sum of Primes
Switch matrix to a column vector
Perfect Square or not
Make roundn function
Converts numbers into characters
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