Math Contest [2 SBI prize] #7 + announcement (previously "mathematical sbi contest")

in #puzzle3 years ago

Here you can keep your brain fit by solving math related problems and also earn SBI by doing so.
The problems usually contain a mathematical equation that in my opinion is fun to solve or has an interesting solution.
I will also only choose problems that can be solved without additional tools(at least not if you can calculate basic stuff in your head), so don't grab your calculator, you won't need it.

Thanks to @tonimontana there is a 2 SBI giveaway for this contest.

Every friday and tuesday!



No upvote, No resteem, No follow required!

I will give 1 SBI to 2 random persons who put a correct solution of the problem in a comment.

You have 48 hours to solve it.

Some additional rules for the case that the problem is an equation or a collection of equations.

In case there are multiple solutions, you have a higher chance of winning if you get all of them correctly.

Solutions can sometimes also be general like x = 20, y > -1. If there are multiple solutions submitted, that are part of the same general solution, they will be counted as one solution.

And one more thing: I only want integer solutions!



Since I'm out of equations for now, there is something different today consisting of 2 steps:

  1. Find the n-th prime, where n is your reputation(the number displayed behind your username).
  2. Sum up all integers between (and including) 1 and your prime.

Also please write down your reputation.

A small example(so you all understand):

"My reputation is 3.
The 3. prime is 5.
1+2+3+4+5 = 15"

You think this is unfair for people with a high reputation?
Only a little bit. Finding this sum is easier then just adding all the terms manually.


You can take a look at the results of the last contest here. There you can also find out how I evaluate your entries.

To everyone who already participated in a past contest, come back today and try a new problem(tell me if you don't want to be tagged):
@addax @ajayyy @bwar @contrabourdon @heraclio @hokkaido @mytechtrail @onecent @sidekickmatt @sparkesy43 @tonimontana @vote-transfer

In case no one gets a result(which I doubt), I will give away the prize to anyone who comments.


My announcements don't seem to last long… My last one was reverted by @contrabourdon (by sponsoring this contest) before I was able to actually implement it.
But here you get it anyway:


From now on there will be 2 contests a week(starting on friday and tuesday).
The topics will sometimes involve more than just equations(like here).
The rewards will be higher on average.


@contrabourdon sponsors this contest with 2 STEEM weekly.
You can support him by using a witness vote on untersatz, so he can further support this and other contests.


My reputation is 52
The 52. prime is 239
(239²+239) /2 = 28.680

My reputation is 45
The 45 prime is 197
197*198/2 = 19,503

My reputation is 53.
The 53. prime is 241.
241*242/2 = 29161

You got voted by @curationkiwi thanks to contrabourdon! This bot is managed by KiwiJuce3 and run by Rishi556, you can check both of them out there. To receive upvotes on your own posts, you need to join the Kiwi Co. Discord and go to the room named #CurationKiwi. Submit your post there using the command "!upvote (post link)" to receive upvotes on your post. CurationKiwi is currently supported by donations from users like you, so feel free to leave an upvote on our posts or comments to support us!
We have also recently added a new whitelist feature for those who would like to support CurationKiwi even more! If you would like to receive upvotes more than 2x greater than the normal upvote, all you need to do is delegate 50 SP to @CurationKiwi using this link.

This post has received a 3.13 % upvote from @drotto thanks to: @curationkiwi.

My reputation is 57. The 57th prime is 269 and 269*270/2=36315.

Here is a free 100% upvote from @contestkings that has a balance of 32,000 SP + 10,500 PAL + 370,000 SPT + 45,000 BATTLE +44,000 NEOXAG.

If you run a contest and need our free community support click here to connect with us today!