That's a beautiful image.
The answer for the first image is wrong. It should be 54784197.
If one looks at the answer set, he/she will see people having been bypassing the first test by fixing the answer. The test cases should be fixed to calculate the sum dynamically with some function forbidden to the user.
The Goldbach Conjecture, Part 2
Matrix with different incremental runs
Back to basics 19 - character types
Volume and area of a sphere
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