Project Euler: Problem 6, Natural numbers, squares and sums.
Bottles of beer
Diagonal of a Spiral Matrix
Radiation Heat Transfer — View Factors (3)
Evened up (or not)
Rule of mixtures (composites) - weighted bound
Divisible by n, prime vs. composite divisors
Lights Out 5 - 5x5, 10 moves
Mechanical Advantage of a Gear Train
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