Could you guys post links to the hardest problem you have ever encountered on Brilliant? That way users who are hunting for difficult problems can solve them and boost their rating. Please do not post answers.

This discussion board is a place to discuss our Daily Challenges and the math and science
related to those challenges. Explanations are more than just a solution — they should
explain the steps and thinking strategies that you used to obtain the solution. Comments
should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .

Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.

Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.

Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

Markdown

Appears as

*italics* or _italics_

italics

**bold** or __bold__

bold

- bulleted - list

bulleted

list

1. numbered 2. list

numbered

list

Note: you must add a full line of space before and after lists for them to show up correctly

There was a number theory before the site was revamped, one that dealt with remainders modulus 19 and included three variables (unknowns, k,a,b based on certain restrictions though). The only answer I saw for that question had an incomplete proof, so that should be sufficient evidence for its difficulty. If anybody here is able to find it...

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in`\(`

...`\)`

or`\[`

...`\]`

to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

Sort by:

TopNewestHi Finn,

I thought this problem was breathtakingly beautiful in it's simplicity.

I'll ask around the office and see if we can dig up a historically absurdly difficult problem for you to look at.

Log in to reply

This probl em is truly mesmerizing.

Log in to reply

This is really a nice problem.I couldn't take up the courage 2 write d correct answer as i was nt sure 4 it.

Log in to reply

Thanks!

Log in to reply

Yeah that one was crazy hard... I mean seriously! That took me forever! ;)

Log in to reply

I Love this problem, took me so long to get the courage to type in the answer

Log in to reply

Yeah, Ryan sums it up pretty well right here.

Log in to reply

This....is.....HILARIOUS!!! :D

Log in to reply

Try this one out: https://brilliant.org/community-problem/an-interesting-problem-264/?group=iiMQMGYWAfX2

Log in to reply

Cool.

Log in to reply

Hi,this problem is deleted so could anyone tell me what was it?

Log in to reply

Exactly, what was it about?

Log in to reply

We are pretty sure this is the hardest algebra problem on Brilliant. Could be wrong though, ratings are a dynamic thing.

Edit: I bungled the link the first time it should work now.

Log in to reply

Wow a problem with over 3000 rating O.o

Log in to reply

That's right, I kneel down when I see this problem...

Log in to reply

Holy moly. \Tries to solve

Log in to reply

Maybe hard. https://brilliant.org/community-problem/strokes/?group=HdtDpoEPM9Zd&ref_id=88876

Log in to reply

Personally thought this algebra problem was particularly difficult :P

Log in to reply

Also, just for fun, you can post a ridiculously easy problem.

Log in to reply

There you go , my friend!! :D

Log in to reply

ridiculuously easy..... x^2 >= xy >= y^2 show that 9(x^2)+6(xy)+(y^2) >= 0

Log in to reply

Can someone post the hardest Combinatorics problem they've come across?

Log in to reply

Hi Jose,

I don't think this is the hardest combinatorics problem on Brilliant, but this one is relatively recent and rated quite high.

Log in to reply

(-1)^π

Hardest problem...

Log in to reply

There was a number theory before the site was revamped, one that dealt with remainders modulus 19 and included three variables (unknowns, k,a,b based on certain restrictions though). The only answer I saw for that question had an incomplete proof, so that should be sufficient evidence for its difficulty. If anybody here is able to find it...

Log in to reply

Knock yourself out:

You won't do it.

Noone's done it.

You might do it.

Log in to reply