Chris problems are kinda my favourite :)
Very nice problem
Make a checkerboard matrix
Figurate number triangle
Find out missing number from a vector of 9 elements
Equal to their cube
Maximum value in a matrix
Compute the largest number whose prime factors sum to n
Evaluate the prime zeta function
Determine digits of the Copeland-Erdos constant
Solve an ODE: equidimensional equation
Investigate the frequency of last non-zero digits of primorials
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