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Whoa, I had no idea that my challenge would have so many of ...

In the diagram above, the black curves show some members of the family \[f_c(x) = c + \arctan x.\] The red curve intersects all members of this family perpendicularly.

If the ...

Use each of the nine digits \(1,2,3,\ldots,9\) exactly once to form prime numbers whose sum is as small as possible.

Enter that smallest sum as the ...

We will be featuring different members of the Brilliant community, so that you can get to know them better. For the third issue, we are featuring Chew-Seong Cheong

Chew Seong ...

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