Remove any row in which a NaN appears
Replace NaNs with the number that appears to its left in the row.
Specific Element Count
Flip the main diagonal of a matrix
Permute diagonal and antidiagonal
Count the primes in Collatz sequences
Identify Ruth-Aaron numbers
Evaluate the zeta function for real arguments > 1
Count the square-full divisors of a number
Solve an ODE: diffusion problem 1
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