What are the hardest problems that have been featured on brilliant.org?

Is there an archive somewhere? If not, can you guys post which ones you remember that were the hardest? I want some practice.

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`bold` or `__bold__`	bold
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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

brb, building search and recommendation features :)

Silas Hundt Staff - 7 years, 4 months ago

Paging @Calvin Lin :P

Michael Tong - 7 years, 4 months ago

I remember one that was in the 3000's a while ago... But I can't find it now :(

Michael Diao - 7 years, 4 months ago

Yeah The rating was somewhere near 3200 .

Dinesh Chavan - 7 years, 4 months ago

I remember one from maybe 4 months ago where it had some stuff about a polynomial and it asked to find the sum of $f(10)$ over all such polynomials and the answer was $360$ or something. I remember seeing only like 25 ppl solved it so I was like woww lol

Michael Tong - 7 years, 4 months ago

This one has a rating of 2977 and it came out recently. Click here to see it

Sharky Kesa - 7 years, 4 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$