## Search found 539 matches

- Fri Dec 20, 2019 5:23 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 027
- Replies:
**25** - Views:
**5960**

### Re: Problem 027

If you'd care to elaborate on such a simple relationship @ PE.net, I would sure appreciate it, as I imagine Lucas-C would too... Take a look at hk's post on the first page of the problem's discussion forum. It shows the relationship between two solutions. If you plot all the related solutions (i.e....

- Thu Dec 19, 2019 10:31 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 027
- Replies:
**25** - Views:
**5960**

### Re: Problem 027

All the solutions on a parabola are related to each other in a very simple way. Given that the solution to the problem lies on such a parabola, it would be a spoiler to discuss it too much.

- Tue Dec 03, 2019 6:51 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 601
- Replies:
**2** - Views:
**253**

### Re: Problem 601

I disagree. $k$ is essentially the length of the streak, i.e. how many consecutive lines in the two examples have divisibility before the line where it is no longer divisible. Like a lucky streak, it is about how long you can keep it going before your luck runs out. The divisibility by 1 is part of ...

- Wed Nov 20, 2019 4:19 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 689
- Replies:
**3** - Views:
**572**

### Re: Problem 689

Thanks for the clarification. I'm still worried that f(x) may not be clearly defined. For example, the decimal fraction 1/2 has two binary representations: 0.1000... and 0.0111.... And those lead to f(1/2) = f(0.1000.. (base 2) ) = 1, and f(1/2) = f(0.0111.. (base 2) ) = π 2 /6 - 1. While these are...

- Fri Jun 28, 2019 7:39 am
- Forum: News, Suggestions, and FAQ
- Topic: Errors/Warnings/Bugs
- Replies:
**527** - Views:
**110227**

### Re: Errors/Warnings/Bugs

We cannot make two consecutive posts in the same solution forum. I think you should be able to edit your post and add the content in the same post. I think you misunderstood the problem. The post is not shown in the problem thread so it cannot be edited. Hopefully it is just a caching problem that ...

- Thu Jun 27, 2019 9:03 am
- Forum: Discrete Mathematics
- Topic: The Satisfiability Problem... NP or P?!
- Replies:
**4** - Views:
**2830**

### Re: The Satisfiability Problem... NP or P?!

https://medium.com/swlh/the-boolean-satisfiability-problem-solved-48ceb5550115 It is badly explained, and is certainly not a proof. It ends with: Considering that it is able to find a solution in most indices, as it usually works with a high probability (80%) then you can always try another index t...

- Tue May 28, 2019 12:44 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 672
- Replies:
**3** - Views:
**4308**

### Re: Problem 672

Thanks for fixing that hk. Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer. Please investigate if $\frac{7^K-1}{11}$ isn't an integer for the values ...

- Tue May 28, 2019 11:35 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 672
- Replies:
**3** - Views:
**4308**

### Problem 672

Is "no nothing" a typo for "do nothing"?

Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer.

Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer.

- Mon May 27, 2019 12:40 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 671
- Replies:
**3** - Views:
**3333**

### Re: Problem 671

I have not solved this question yet, but have worked out F_4(3) on paper. @amagri: I believe those are indeed forbidden, so for both those reasons you cannot use a 1x3 tile when n=3. @MuthuVeerappanR: I think rotations around the axis of the loop are not considered different. I get 24+24+24+24+8 = 1...

- Mon May 20, 2019 12:31 am
- Forum: News, Suggestions, and FAQ
- Topic: Recover account
- Replies:
**4** - Views:
**3073**

- Fri May 17, 2019 5:36 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 647
- Replies:
**2** - Views:
**2986**

### Re: Problem 647

I know that quite some folk have solved this one already and it doesn't look too daunting, really - except that: well I'm getting 186 and not 184 as result for F_3(100). It really is 184. If you want, you can send me the pairs (A,B) that make up the sum by private message (you should have only four...

- Sat Mar 16, 2019 8:59 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 600
- Replies:
**1** - Views:
**722**

- Wed Mar 06, 2019 4:21 pm
- Forum: News, Suggestions, and FAQ
- Topic: Project Euler Style Sheet Update
- Replies:
**33** - Views:
**10233**

### Re: Project Euler Style Sheet Update

First, I don't know how to switch from the dark theme to light or vice versa. Is this missing, hidden, or am I just blind? In the Account tab, there is a section with Country, Language etc, including Theme. Change the Theme from Dark to Default (and click the Update Details button) to go back to wh...

- Mon Mar 04, 2019 9:30 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 425
- Replies:
**28** - Views:
**7230**

- Wed Feb 20, 2019 10:57 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 656
- Replies:
**9** - Views:
**1687**

### Re: Problem 656

In the wording of the problem, I don't think it is a good idea to use the letter n for two different variables - first as the index of the sequence, then as an element of T. I think it would be better to change the second use to a variable named t for example.

- Mon Jan 28, 2019 10:31 am
- Forum: News, Suggestions, and FAQ
- Topic: désaccord sur décimales de sqrt(2)
- Replies:
**1** - Views:
**2715**

- Sat Jan 12, 2019 10:00 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 196
- Replies:
**34** - Views:
**10897**

### Re: Problem 196

I've sent a private message.

- Mon Dec 24, 2018 5:49 am
- Forum: News, Suggestions, and FAQ
- Topic: Hairsplitting Curiosity (w/ Alliteration)...
- Replies:
**6** - Views:
**2130**

### Re: Hairsplitting Curiosity (w/ Alliteration)...

https://projecteuler.net/about=aliases If you hover over a poster's name in a solution thread (specifically the ones that are in italics, which indicates it is an alias), you will see a tooltip showing the account username. Unfortunately the quoting system always seems to display the username, not i...

- Sat Dec 15, 2018 5:48 am
- Forum: Discrete Mathematics
- Topic: Sorting...
- Replies:
**4** - Views:
**5825**

### Re: Sorting...

You have re-invented the Pigeonhole sort.

The wiki page on sorting algorithms has a separate section for non-comparison integer sorts like this. Its main disadvantage is that its running time and its memory requirements depend on max, not just on n.

The wiki page on sorting algorithms has a separate section for non-comparison integer sorts like this. Its main disadvantage is that its running time and its memory requirements depend on max, not just on n.

- Fri Nov 16, 2018 3:47 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**17** - Views:
**8828**

### Re: Problem 351

If you ever need more than, say, 600MB of data, then you are probably doing it wrong. You are either using the wrong solving method, or maybe you just don't need to have all of that data in memory at the same time.