All you need to do here is submit your solution a prime number of seconds after the top of the hour. Any hour at all... Easy, right?
Replace NaNs with the number that appears to its left in the row.
Renaming a field in a structure array
Permute diagonal and antidiagonal
Swap two numbers
Pandigital Multiples of 11 (based on Project Euler 491)
Circular Primes (based on Project Euler, problem 35)
It's going down. We're finding simbers!
A matrix of introverts
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