## Search found 23 matches

- Wed Dec 18, 2019 7:51 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 037
- Replies:
**45** - Views:
**10807**

### Re: Problem 037

@Junglemath, I posted an explanation in the forum, though you've since deleted your questions. Guess you figured it out before I finished my post

- Wed Dec 11, 2019 8:24 pm
- Forum: Resources
- Topic: Nim Problems
- Replies:
**1** - Views:
**429**

### Re: Nim Problems

If you search on "Stone Game" you'll find a few more Nim-style games: 260 Stone Game 70% 325 Stone Game II 80% 366 Stone Game III 40% 550 Divisor Game 55% There are many others which turn out to be impartial games using Sprague-Grundy, but I won't point those out since it's not always as obvious tha...

- Mon Nov 25, 2019 7:22 am
- Forum: News, Suggestions, and FAQ
- Topic: New awards.
- Replies:
**68** - Views:
**23154**

### Re: New awards.

Thanks, @euler. I really like the idea of the two awards, with one for hitting half the levels. That answers the big reservation I had about my suggested award, which would be too oriented toward those already in the advanced levels.

- Tue Oct 22, 2019 12:45 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 009
- Replies:
**47** - Views:
**12941**

### Re: Problem #9

No, and in fact they couldn't possibly be. If a, b, c are all consecutive, then a+b+c = a+(a+1)+(a+2) = 3a+3, which is a multiple of 3. 1000 is not a multiple of 3, so it can't be the sum of 3 consecutive integers.

- Mon Aug 26, 2019 3:47 am
- Forum: News, Suggestions, and FAQ
- Topic: Statistics Levels no longer works
- Replies:
**2** - Views:
**408**

### Re: Statistics Levels no longer works

Until it's fixed, you can still go directly to the page for a specific level, e.g. https://projecteuler.net/level=5

- Tue Jun 25, 2019 6:17 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 674
- Replies:
**1** - Views:
**3462**

### Re: Problem 674

My solution didn't look to see if any two lines were the same, so I'd say (1) you're to count the two lines of "va" as two distinct I-expressions and (2) order doesn't matter when pairing up lines, so only look at one of the two possible orderings.

- Mon Apr 22, 2019 6:49 am
- Forum: Clarifications on Project Euler Problems
- Topic: Clarification on Project Euler Problems...
- Replies:
**2** - Views:
**1267**

### Re: Clarification on Project Euler Problems...

They're both prime, so certain useful theorems in modular arithmetic which require either a prime or coprime modulus will work (intentionally not saying what those are - plenty of problems revolve around discovering those). Also, they're below $2^{30}$, so if you compute $a*b \pmod{1000000007}$, whe...

- Wed Apr 03, 2019 9:51 pm
- Forum: News, Suggestions, and FAQ
- Topic: New awards.
- Replies:
**68** - Views:
**23154**

### Re: New awards.

Not sure how open the team is to adding new awards, but since the recent website updates, at least the array of awards flows better as the number of awards changes. So here's an idea I've had for a while. How about an award for solving at least 1 problem in all 20 possible difficulty levels? I'm a b...

- Tue Nov 13, 2018 8:07 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 521
- Replies:
**9** - Views:
**4236**

- Wed Nov 07, 2018 9:56 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 640
- Replies:
**7** - Views:
**3204**

### Re: Problem 640

Your values for N=2 or 3 are correct. The rest are incorrect.

- Thu May 03, 2018 7:58 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 200
- Replies:
**23** - Views:
**6874**

### Re: Problem 200

Could anyone post a number that ends with either 1 or 3 or 7 or 9 (i.e., one of those numbers is in its units place) that is prime-proof? It does not have to be a sqube let alone one that contains 200. If you've solved the problem, take a look at my post from 15 Jan 2018. I ran through the first 10...

- Thu Apr 26, 2018 4:23 am
- Forum: News, Suggestions, and FAQ
- Topic: Localizing custom MathJax macros & commands
- Replies:
**0** - Views:
**2956**

### Localizing custom MathJax macros & commands

You can define new macros in MathJax, e.g. \def\D{{\mathbb{D}}} to create a shortcut \D to display $\mathbb{D}$. The problem is that will affect the rest of the current page, bleeding into following posts. Is there a way to localize such definitions? I see that MathJax has a \begingroup..\endgroup c...

- Sun Apr 22, 2018 2:40 pm
- Forum: News, Suggestions, and FAQ
- Topic: Errors/Warnings/Bugs
- Replies:
**527** - Views:
**110172**

### Re: Errors/Warnings/Bugs

I've got a post here on the latest problem, 625, that looks fine on Windows browsers (Chrome, Firefox, Edge), but was garbled under Safari on iOS (up-to-date 2017-vintage iPad and an iPhone 5S). There were double-dollar delimited LaTex expressions, tagged 4 and 6, where the following text was missin...

- Wed Feb 14, 2018 6:18 am
- Forum: News, Suggestions, and FAQ
- Topic: Collapsible text section suggestion
- Replies:
**8** - Views:
**2291**

### Re: Collapsible text section suggestion

Thanks again for implementing the collapse BBCode. Don't want to sound ungrateful, but I'm seeing behavior which might be intentional or just a bug. I can't nest other BBCodes inside a collapse block. I wanted to use collapse around an image, so the image wouldn't take excessive space, but it didn't...

- Sun Feb 11, 2018 10:31 pm
- Forum: News, Suggestions, and FAQ
- Topic: Collapsible text section suggestion
- Replies:
**8** - Views:
**2291**

### Re: Collapsible text section suggestion

You can see the use case I had in mind in my reworked 31 Jan 2018 post in

**Problem 209**(View Problem). The new BBCode reduces my post from way too long to just wordy. Brevity, alas, may be beyond me.- Sun Feb 11, 2018 8:09 am
- Forum: News, Suggestions, and FAQ
- Topic: Collapsible text section suggestion
- Replies:
**8** - Views:
**2291**

### Re: Collapsible text section suggestion

Whoa, I hadn't noticed my suggestion had been implemented. Very nice - and I like the ability to title the collapsed block. Thanks indeed, euler.

- Tue Jan 30, 2018 9:31 am
- Forum: News, Suggestions, and FAQ
- Topic: Collapsible text section suggestion
- Replies:
**8** - Views:
**2291**

### Collapsible text section suggestion

I'd like to post something fairly involved in a problem forum, but want it to be normally collapsed in the same way as code blocks. Unlike a code block, though, I'd like to post with the normal formatting available. In particular, I'd like MathJAX to work. The use case is when I want to include a le...

- Tue Jan 23, 2018 8:04 pm
- Forum: News, Suggestions, and FAQ
- Topic: You cannot make double posts error
- Replies:
**3** - Views:
**1779**

### Re: You cannot make double posts error

Looks like this is happening again. I tried to post to problem 194's forum and got an error when I submitted. My progress page reports I have a post up for 194, but it's not visible, and any attempt to post a new reply gives me the "double post" message. Did my post make it to the DB and this is a c...

- Sun Dec 03, 2017 1:30 am
- Forum: News, Suggestions, and FAQ
- Topic: Difficulty Rating for New Problems
- Replies:
**20** - Views:
**3440**

### Re: Difficulty Rating for New Problems

Hmm, I guess that means Poohsticks Marathon, 589 was supposed to be easy, given the standard posting cadence? If it makes you feel better, I did assess this one as Medium, but was out-voted. It's one of those that depends on you having mastered a technique from earlier in the problem set. Eh, that'...

- Sat Dec 02, 2017 9:34 pm
- Forum: News, Suggestions, and FAQ
- Topic: Difficulty Rating for New Problems
- Replies:
**20** - Views:
**3440**

### Re: Difficulty Rating for New Problems

Hmm, I guess that means Poohsticks Marathon,

**Problem 589**(View Problem) was supposed to be easy, given the standard posting cadence? Well, that's discouraging . That one's been kicking my butt for a month now . I could solve it if the one-minute rule was loosened to, say, a one-year rule.