## Search found 6 matches

- Wed Apr 03, 2019 6:34 pm
- Forum: Combinatorics
- Topic: Number of ordered ways of writing n as the sum of 3 triangular numbers
- Replies:
**0** - Views:
**101**

### Number of ordered ways of writing n as the sum of 3 triangular numbers

Hello colleagues, I've implemented strait forward algorithm for case 3 according to page 6 On the representation of integers as sums of triangular numbers But it produces wrong results for n = { 3, 9, 12, 18, 21, 30, 34, 39, 45, 48, 57, 59, 63, 66, 67, 75, 84, 93 }. Can somebody give me a hint what ...

- Tue Feb 19, 2019 3:00 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 656
- Replies:
**9** - Views:
**552**

### Re: Problem 656

I have had an errors at { 677, 730, 785, 842, 901, 962 }

Fixed.

Solved.

Thanks for collaboration.

Fixed.

Solved.

Thanks for collaboration.

- Mon Feb 18, 2019 6:46 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 656
- Replies:
**9** - Views:
**552**

- Tue Nov 20, 2018 7:24 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 643
- Replies:
**8** - Views:
**2437**

### Re: Problem 643

Looks like expansion of PI

^{-2}, but...- Mon Nov 05, 2018 7:40 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 641
- Replies:
**5** - Views:
**1711**

### Problem 641

Can any body confirm following sequence <snipped by moderator>?

Thank you.

Thank you.

- Thu Sep 27, 2018 9:31 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 637
- Replies:
**3** - Views:
**644**

### Re: Problem 637

Correct sequence, should looks like:
and f(99999,10)=2

Code: Select all

```
99999=>
1. 9999+9=10008=>
2. 1+8 => 9
```