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$1,500 in prize money and unique problems. Register for the TrialSpark x Coder Cup competition by Feburary 22 before space runs out. Also, TrialSpark is hiring engineers.

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The most creative correct solution wins $100. Submissions for prize money are now closed.

What is the length of the shortest pipe, of internal radius 50mm, that can fully contain 21 balls of radii 30mm, 31mm, ..., 50mm? Give your answer in micrometres (10^(-6) m) rounded to the nearest integer. https://projecteuler.net/problem=222

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