Specific Element Count
Back to basics 22 - Rotate a matrix
We love vectorized solutions. Problem 1 : remove the row average.
Lychrel Number Test (Inspired by Project Euler Problem 55)
Determine aquifer properties: unsteady pump test in a confined aquifer
Find pairs of primes with the same digit sum and a specified separation
Iterate the sum of divisors and totient
Find the smallest integer m such that n divides m!
Solve an ODE: second-order linear equation with constant coefficients
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