Chris problems are kinda my favourite :)
Very nice problem
Return the 3n+1 sequence for n
subtract central cross
Fix the last element of a cell array
Solve an ODE: diffusion problem 2
Find pairs of primes with the same digit sum and a specified separation
Deduce the pattern behind the sequence
Solve an ODE: equation for a 2D laminar jet
List the delete-a-digit primes
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