Submitting Problems to Brilliant is going away for a few months

Over the past several months, we have received an impressive number of challenging, clever, and fun problems from all of you. Writing good problems is hard, and we have been inspired by the number of you who are willing and able to produce great ones.

The problems you all have submitted have taught us that only a small portion of problems that people write, are problems that fit our very strict criteria to be featured in our problem sets. What they have also taught us, is that our strict criteria excludes tons of interesting problems that all of you would find fun to solve. Further more, if a math problem is unclear, or needs work; it would be much better to have the community provide detailed constructive feedback on the problem, rather than be dismissed by us.

Over the next several months we will be working to reinvent the way problems and discussions are published and disseminated on Brilliant. We would like our members to have the ability to publish problems, hosted in our interface, and disseminate them to the people they like solving problems with on Brilliant. Unfortunately, this will take awhile to build.

We have taken down the problem submitting button, to divert our efforts toward enabling problem publishing for everyone. The time saved by not having to maintain the currently inefficient process of problem submission, will be better applied toward making the site experience better for everyone.

In the mean time... if you have a good problem that you think others here would enjoy, post it to discussions. If they are disciplined, your audience can avoid looking at people's answers until they have tried to solve it. While not the same, it somewhat approximates the experience of our weekly problems.


The team behind

Note by Peter Taylor
7 years ago

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33 votes

  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:

  • 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.

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link]( link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 2×3 2 \times 3
2^{34} 234 2^{34}
a_{i-1} ai1 a_{i-1}
\frac{2}{3} 23 \frac{2}{3}
\sqrt{2} 2 \sqrt{2}
\sum_{i=1}^3 i=13 \sum_{i=1}^3
\sin \theta sinθ \sin \theta
\boxed{123} 123 \boxed{123}


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I really salute the people like Peter working for this website. They are very enthusiastic and trying to make the site better and better. My best wishes!

Snehal Shekatkar - 7 years ago

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Might be helpful to have an option that thread authors could toggle that hides replies until the reader pushes a "Show" button, say. That way, there's no chance of having part of the solution onscreen.

Yes, there's always finagling we can do client-side to hide it (resizing window, using a second window to cover the partial solution, etc.), but once part of the solution has been on the screen and you've seen it, even peripherally, you can never be sure how much of that solution registered in your brain before you blocked it out. Even accidentally recognizing a particular function or number can be a give-away.

I know that's yet more work for you guys, but....

(Could also have a separate "User-Submitted Problems" subforum where this feature is always on for all posts. In fact, that may not be such a bad idea even without the solution-hiding feature.)

Christopher Johnson - 7 years ago

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Yeah, a spoiler tag would be helpful.

Kevin Fei - 7 years ago

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Sounds like a good idea and it would definitely be doable. I would say they could implement such a feature from a day to maybe a week depending on how complex their forum infrastructure is.

Julio Reyes - 7 years ago

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I have one.

What is the remainder when 220132^{2013} is divided by 55

Mohith Manohara - 7 years ago

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Since 221(mod5)2^2\equiv -1\pmod{5}, 22013=2(22012)2(1)10062(mod5)2^{2013}=2(2^{2012})\equiv 2(-1)^{1006}\equiv\boxed{2}\pmod{5} Alternatively, use FLT or find the pattern.

Daniel Chiu - 7 years ago

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Daniel C. - What's FLT ?

Kishlaya Jaiswal - 7 years ago

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The last digit of 22013 2^{2013} is 2 so the remainder is 2.

Tan Li Xuan - 7 years ago

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Wow, crazy simple answer.

Tanishq Aggarwal - 7 years ago

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it is 2 use fermats little theorem

Kaustubh Miglani - 5 years, 1 month ago

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There are a set of questions from RMO-1990....The questions are as follows:

1) N is 50 digit number. All the digits except 26th digit from the left are 1 . If N is divisible by 13 ,then find the 26th digit?

2)A square sheet paper ABCD is folded such that B falls on the midpoint M of CD . Then the crease divides the BC in the ratio a/b , where a and b are coprime integers. Then * a+b = ? *

Vaibhav Reddy - 7 years ago

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well...i don't know how to use typo...

Vaibhav Reddy - 7 years ago

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How Do I Submit issues now?

Gabriel Merces - 6 years, 12 months ago

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