First non-zero element in each column
Similar Triangles - find the height of the tree
Sum of diagonal of a square matrix
Count up then down
Create matrix of replicated elements
Solve an ODE: diffusion problem 2
List composite numbers that cannot be written as the sum of two primes
Compute the date of a special marriage milestone
Investigate the frequency of last non-zero digits of primorials
Determine whether a square can be drawn on a grid of dots
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