Right, back to the drawing board then ...

Thanks for getting back though!

## Search found 14 matches

- Fri Jul 12, 2019 8:03 am
- Forum: Clarifications on Project Euler Problems
- Topic: problem 155
- Replies:
**14** - Views:
**4877**

- Tue Jul 09, 2019 5:00 pm
- Forum: Clarifications on Project Euler Problems
- Topic: problem 155
- Replies:
**14** - Views:
**4877**

### Re: problem 155

Hi all, Could I ask for two pieces of input here: 1) D(13) is a 5-digit figure starting with a 4 and ending in an even digit - is that correct? 2) I'm using float values in C and my suspicion is that my solutions turns out wrong because of a precision issue. I've tried (long) double but the result i...

- Fri May 17, 2019 7:34 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 647
- Replies:
**2** - Views:
**2707**

### Re: Problem 647

Thanks for your quick response, jaap. And thanks also for the offer of a PM conversation. I won't bother you just yet as I've actually only got three pairs so clearly there's something massively wrong with my approach. Back to the drawing board then. Cheers, Claude ******** EDIT 10 minutes later: No...

- Fri May 17, 2019 3:38 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 647
- Replies:
**2** - Views:
**2707**

### Problem 647

Hello all, 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). Is that a typo that has been missed because people have gone straight on to the grown-up stuff with Sigma_k F_k(10^3) -...

- Fri Mar 22, 2019 7:04 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 233
- Replies:
**36** - Views:
**12843**

### Re: Problem 233

Blimey, got there in the end - and I can't believe how long I spent looking at the code when it turned out to be basically sound and my mistake was somewhere entirely else... I know see why so many people seem to be getting the same false result as I did: and to all my bothers and sisters out there ...

- Wed Mar 20, 2019 7:51 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 233
- Replies:
**36** - Views:
**12843**

### Re: Problem 233

Nothing particularly interesting to say, other than that I'm one of those who get the 'classic but wrong' answer for 10^10 as well even though the answer for 38000000 is correct.

So if, as I rather expect, I end up going completely mad over this one, please come and visit me at the hospital

DeKlod

So if, as I rather expect, I end up going completely mad over this one, please come and visit me at the hospital

DeKlod

- Mon Mar 04, 2019 4:03 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 157
- Replies:
**21** - Views:
**7327**

### Re: Problem 157

Can I just add another voice to the call for a slight clarification on this problem: I feel that instead of asking for how many solutions there are for 1<=n<=9, it would be clearer of the question asked for the sum of s(n) where s(n) stands for the number of solutions for a particular value of n... ...

- Fri Nov 16, 2018 3:02 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**7769**

### Re: Problem 351

Thanks for that, jaap! Just one last question, if I may: is there any other obvious technique if you really need large quantities of data? Imagine a sieve for primes up to - say - 10^12. Vectors of type bool seem to be fine up to about 10^10 but not further. So I guess that's where you need to chang...

- Fri Nov 16, 2018 12:00 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**7769**

### Re: Problem 351

Cheers Jaap, I'm afraid I'll have to confess my ignorance on the first question (I'll google that though). I do use vectors, yes, but I would have thought it would pose problems of efficiency too as it will take up a lot of memory. I'll try that approach over the weekend though and see what happens ...

- Fri Nov 16, 2018 7:54 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**7769**

### Re: Problem 351

Hello all, Maybe someone could enlighten me on this one: the PDF solution sheet for this problem describes several possible algorithms of varying efficiency, yet they mainly seem to rely on an array containing all the required integer values, i.e. 10^8 numbers in this case. On my system and using C/...

- Mon Oct 01, 2018 11:34 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 609
- Replies:
**10** - Views:
**2875**

### Re: Problem 609

Hi all, I was wondering whether someone would be good enough to check the following values for me (all given modulo 1'000'000'007): P(1000) = Values removed by moderator P(10'000) = P(100'000) = P(1'000'000) = P(10'000'000) = Thanks in advance! Claude EDIT: Disregard this, everyone... I missed a mod...

- Sun Sep 09, 2018 10:43 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 630
- Replies:
**4** - Views:
**897**

### Re: Problem 630

Well, this one is still haunting me. I now get a total of 3***626 unique lines.

Could someone check whether this seems correct (and if not possibly let me know the last couple of digits so I'll know when I'm approaching the answer - or would that already be a form of cheating?)

Cheers,

Claude

Could someone check whether this seems correct (and if not possibly let me know the last couple of digits so I'll know when I'm approaching the answer - or would that already be a form of cheating?)

Cheers,

Claude

- Wed Aug 22, 2018 10:34 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 630
- Replies:
**4** - Views:
**897**

### Re: Problem 630

Thanks Animus, I'll have another look at that bit then

- Tue Aug 21, 2018 7:57 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 630
- Replies:
**4** - Views:
**897**

### Problem 630

Hi all,

Problem 630 has been driving me up the wall for a few days now - I'm sure I'm missing something really stupid but I can't figure it out yet.

Could someone perhaps confirm that I've at least got the correct number of (unique) lines: I get 3***890...

Cheers,

Claude

Problem 630 has been driving me up the wall for a few days now - I'm sure I'm missing something really stupid but I can't figure it out yet.

Could someone perhaps confirm that I've at least got the correct number of (unique) lines: I get 3***890...

Cheers,

Claude