Are you happy or unhappy? (You thought it was over?)

Algebra Level pending

A slight change in the problem:

Remember, in the previous problem, we were taking one dot away from the first sector and putting it in the next sector. Then, we took away two dots from the second sector and put it in the next sector, and so on and so forth.

What happens if instead:

  1. Take one dot from first sector, put it in next sector.

  2. Take two dots from 2nd sector (from where you just put 1 dot in) and put it in next sector.

  3. NOW Instead of taking one away from the next sector, you take 3 dots away from the next sector.

And repeat the pattern.

Of course, the same rules apply for happy and unhappy number as from before.

What is the largest happy number with these new rules lower than 5,000,000,000?

For the original problem, go to the "My favorites" set and find the problem, Are you happy or unhappy? OR go to this link:

https://brilliant.org/profile/jonathan-ydncjm/sets/are-you-happy-or-unhappy/

Remember, follow for more cool stuff! (Is this the end of the happy problem?)


The answer is 3486784404.

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2 solutions

Jack H.
May 30, 2015

I think I notice something about these happy problems. I modeled them out with some blocks and was playing around. I noticed that the first block you move never goes away. This is obscure to the human eye at first, because dots are identical. Anyways, I took away the block, and I noticed that we can skip doing anything with every alternate section. Now if you play for a while, every section has two blocks. This was just a start to it all, but I stopped here, and noticed the form of happy numbers, and transferred that to the newest problem. **I am not going to say the complete solution because of other trolls from Lexington. If you want me to explain it fully, I will do so.

Luka Krešić
May 8, 2015

Love this one. How so Everybody who solved this is Set is from lexington?hahahaha. I won't Write the solution so i don't ruin your set. Continue with IT please

There is only one person who can solve this problem legit in Lexington. The others just got the answer from that person :(

Jonathan Hsu - 6 years, 1 month ago

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Interedting. I am so proud now haahahahhaa

Luka Krešić - 6 years, 1 month ago

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yep, you should be :)

Jonathan Hsu - 6 years, 1 month ago

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@Jonathan Hsu What is power OF two in that other one? I missed that one

Luka Krešić - 6 years, 1 month ago

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@Luka Krešić another cool problem to solve is my number theory question. I think you will like it. And for thew power of two question, if you know the formula, i am pretty sure you can get it.

Jonathan Hsu - 6 years, 1 month ago

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@Jonathan Hsu Ok. Thanks. I missed my try already so i am out for that one ahahahahha

Luka Krešić - 6 years, 1 month ago

It really annoys me that people from Lexington are cheating on brilliant just to be trolls. Can you make sure that in your future problems, you don't tell anyone about it, or if you find that they are cheating, report them? It really hurts me that they get as much credit as people like Luka and me, who start from scratch.

Jack H. - 6 years ago

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