## Search found 27 matches

- Sat Jan 13, 2018 8:28 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 617
- Replies:
**6** - Views:
**1793**

### Problem 617

D(100)=21 means there are 21 unique sequences for e, n? So like Is 2 4 2 4 2 ... different from 4 2 4 2 4 ... ? Don't want to give too much away, but if I understand correctly, trying different e, n, and a_0 (at 2... for all) only produces D(100) = 19 so I feel like there's something I'm missing fro...

- Sun Sep 18, 2016 6:25 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 569
- Replies:
**2** - Views:
**1082**

### Re: Problem 569

Ah yes. That one's off. Thank you. Funny thing is when making primes by hand... "49" isn't prime.

- Sun Sep 18, 2016 4:11 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 569
- Replies:
**2** - Views:
**1082**

### Problem 569

I worked this out by hand, but I can't seem to verify "from the 9th mountain, he can see three peaks, those of the 5th, 7th and 8th mountain" If, the mountain peaks were on a grid, then their coordinates would be : 9 - (430, 30) 8 - (328, 26) 7 - (238, 22) 5 - (100, 16) The slope from 9th peak to 5t...

- Tue Nov 27, 2012 9:40 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 403
- Replies:
**10** - Views:
**3101**

### Re: Problem 403

hk wrote:@ mctrafik: your lattice points count is off for several a,b pairs.

Excellent. That's what I was hoping to hear. Just wanted to make sure I got (a, b) pairs correctly. Thank you.

- Tue Nov 27, 2012 5:29 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 403
- Replies:
**10** - Views:
**3101**

### Re: Problem 403

Maybe someone else got the same problem. I keep getting S(5) = 360. Can't seem to find where I'm going wrong. Here are the (a, b) pairs I'm getting and how many points are there between the line and the parabola: 0 0 [1] 0 1 [4] 1 0 [2] -1 0 [2] 1 2 [8] -1 2 [8] 2 -1 [1] -2 -1 [1] 2 0 [4] -2 0 [4] 3...

- Mon Nov 26, 2012 6:21 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 403
- Replies:
**10** - Views:
**3101**

### Re: Problem 403

Thank you! Most helpful!

- Mon Nov 26, 2012 5:17 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 403
- Replies:
**10** - Views:
**3101**

### Re: Problem 403

I'm sorry. What? 403.gif? Where is it?

- Sun Nov 25, 2012 5:32 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 403
- Replies:
**10** - Views:
**3101**

### Problem 403

This is a stupid question,

but what lattice points are being referred to? Dimond, rectangle or square? So like are the coordinates like (0, 0), (0, 1) .. (1, 0), (1, 1) .... or something else?

A picture would be nice

but what lattice points are being referred to? Dimond, rectangle or square? So like are the coordinates like (0, 0), (0, 1) .. (1, 0), (1, 1) .... or something else?

A picture would be nice

- Fri Nov 23, 2012 2:54 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 402
- Replies:
**11** - Views:
**3461**

### Re: Problem 402

Hm... I was suspecting that S(1) = 2 as the case where a = b = c = 1. I get the same numbers as you then. Damn it. I was hoping I was getting something wrong. Just can't see the pattern. Sadness. Thank you. Edit: then I guess C(15) = 601,313,396? Again. Hoping I'm off because this number is more out...

- Thu Nov 22, 2012 10:09 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 402
- Replies:
**11** - Views:
**3461**

### Re: Problem 402

So totally hate this problem. Want to get that badge for the latest five. This is my last chance. Only got two days left. Grr. Sleepless nights. Hate number theory. I'm losing my mind here. 0.o <- is what I look like.. unless it's this 0(-_-)0...z...Z....ZZZ...ZZz for like five minutes, then back to...

- Fri Nov 16, 2012 10:21 pm
- Forum: News, Suggestions, and FAQ
- Topic: Show problem statistics on problem description page.
- Replies:
**9** - Views:
**3789**

### Re: Show problem statistics on problem description page.

Why would you want to not see the number of people who solved it? In case you want to find easy or hard problems, this is a definite clue to the difficulty. I'm pretty sure the number of people attempting the latest problem doesn't fluctuate much, unless they are influenced by the number of people s...

- Wed Nov 14, 2012 5:23 pm
- Forum: News, Suggestions, and FAQ
- Topic: Show problem statistics on problem description page.
- Replies:
**9** - Views:
**3789**

### Re: Show problem statistics on problem description page.

I had no idea! This definitely is what I was looking for. Hidden functionality FTW.euler wrote: once you're on a particular problem page you can hover the mouse over "Problem XXX" to display a tooltip with the number of members having solved that problem.

- Wed Nov 14, 2012 2:08 am
- Forum: News, Suggestions, and FAQ
- Topic: Show problem statistics on problem description page.
- Replies:
**9** - Views:
**3789**

### Re: Show problem statistics on problem description page.

Yes Marcus. I'm not saying the stats are unavailable. I'm saying they're not well-placed because the first list has 50 problems when I reload it to look up stats for a single problem and second link I sometimes fail to find at all.

- Tue Nov 13, 2012 9:47 pm
- Forum: News, Suggestions, and FAQ
- Topic: Show problem statistics on problem description page.
- Replies:
**9** - Views:
**3789**

### Show problem statistics on problem description page.

For logged in users I suggest you show some statistics like: # of people solved this problem Time to first correct solution ratio of correct/incorrect submission or ration of people that got it correct out of all the people that tried a solution. I find myself looking at list of all problems a lot t...

- Thu Nov 08, 2012 5:44 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 397
- Replies:
**8** - Views:
**3067**

### Re: Problem 397

Thank you so much.ffff0 wrote:I've sent a PM with a list.

@LuckyRod

Also this was a clarification question. I'm pretty sure the challenge of the question is not checking for a 45-degree angle.

- Wed Nov 07, 2012 11:40 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 397
- Replies:
**8** - Views:
**3067**

### Problem 397

Can someone post working a, b, c as an example? Or better yet the 41 of them for the case F(1, 10). For some reason I get 67 and don't know which ones are wrong. I double-checked my math and it seems solid. Here are the numbers I get (a, b, c, k): -10 -9 10 1 -10 9 10 1 -9 -8 9 1 -9 8 9 1 -9 9 10 1 ...

- Mon Oct 22, 2012 5:10 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 399
- Replies:
**11** - Views:
**3149**

### Re: Problem 399

- From oeis wiki.Squareful numbers are numbers for which at least one prime factor exponent is 2, thus are not squarefree numbers, not to be confused with squarefull numbers, numbers for which each prime factor exponent is at least 2.

- Mon Oct 22, 2012 12:01 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 399
- Replies:
**11** - Views:
**3149**

### Problem 399

Wanted to say a couple things: So the goal is to skip the "not squarefree" as opposed to "squareful" numbers from the fibonacci sequence, right? That's one clarification I had. I wanted to know if someone found it useful to look into squareful numbers for this one. And as always, not asking for any ...

- Mon Sep 10, 2012 9:20 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 393
- Replies:
**11** - Views:
**3592**

### Re: Problem 393

So f(3) = 0 because there's nowhere the center ant can move. Am I correct?

- Sat Oct 29, 2011 11:06 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 169
- Replies:
**17** - Views:
**6711**

### Re: Problem 169

I'm not understanding the problem correctly. Number of ways to write a number using powers of two at most twice looks like a sum of two numbers (which in binary representation will contain only powers of two and since there are two numbers each power will only occur at most twice). This is largely s...