## Search found 17 matches

- Sat Feb 02, 2019 6:41 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 090
- Replies:
**46** - Views:
**14306**

### Re: Problem 090

Thanks RobertStanforth. Turns out my understanding to "distinct arrangement" was mistaken. I wrongly treated the two set-of-set {{0, 1, 2, 3, 4, 5}, {0, 1, 2, 3, 6, 8}} and {{0, 1, 2, 3, 6, 8}, {0, 1, 2, 3, 4, 5}} as distinct. Going through the whole thread again, people were reminded for this earli...

- Fri Feb 01, 2019 4:02 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 090
- Replies:
**46** - Views:
**14306**

### Re: Problem 090

As a non-English speaker allow me to elaborate how I understand the problem statement and why I am having (present tense!) trouble with it. I cannot properly grasp the meaning of the compound noun "distinct arrangement". It appears only twice throughout. First occurrence: In determining a distinct a...

- Thu Jan 17, 2019 2:54 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 106
- Replies:
**32** - Views:
**11182**

### Re: Problem 106

I cannot explain why... This question appears to be a riddle more than a mathematics / programming challenge...

- Thu Jan 17, 2019 2:45 pm
- Forum: Recreational
- Topic: Winning Lottery with Prime Number!?
- Replies:
**8** - Views:
**9293**

### Re: Winning Lottery with Prime Number!?

Possibly be "The Call of the Primes: Surprising Patterns, Peculiar Puzzles, and Other Marvels of Mathematics", by Owen O'Shea, publisher Prometheus Books. If I am correct both are from British.

- Sun Jan 21, 2018 9:03 am
- Forum: Recreational
- Topic: Winning Lottery with Prime Number!?
- Replies:
**8** - Views:
**9293**

### Re: Winning Lottery with Prime Number!?

Hello Stephen, Thank you for sharing your presentation. It seems that "birthday numbers are more popular" applies to the West too. Unluckily I could not recall the book correctly. At first I thought the book was "What Are the Odds?" by Tim Glynne-Jones, published by Arcturus Publishing Limited (ISBN...

- Sat Jan 13, 2018 12:26 pm
- Forum: Recreational
- Topic: Winning Lottery with Prime Number!?
- Replies:
**8** - Views:
**9293**

### Re: Winning Lottery with Prime Number!?

Hi jaap, Thanks for demonstrating the probability! Only the idea of "betting prime numbers" didn't pop up in my mind at all before, together with the 6/7 prime, the coincidence adds a little mistique... At least from my oriental perspective 8-) I am betting on Fibonacci numbers in coming draw, which...

- Fri Jan 12, 2018 3:28 pm
- Forum: Recreational
- Topic: Winning Lottery with Prime Number!?
- Replies:
**8** - Views:
**9293**

### Winning Lottery with Prime Number!?

Yesterday night we had a lottery snow ball more than HKD 110 million. Suddenly an idea floated up: Will betting all prime numbers get me first prize? The draw picks 6 plus 1 special number out of 1 to 49. A gambler bets for 6 out of 1 to 49. If gambler hit all 6 non-special number, he gets first pri...

- Fri Jan 12, 2018 3:09 pm
- Forum: Programming languages
- Topic: New Preferred Programming Language Requests
- Replies:
**159** - Views:
**68965**

### Re: New Preferred Programming Language Requests

It would still be APL, specifically, NARS2000, the ultimate desktop calculator. Mr. Bob Smith told in comp.lang.apl that he added high precision number for tackling Project Euler!

- Sun Dec 24, 2017 12:57 pm
- Forum: Number
- Topic: Repeating Decimal and Prime Number
- Replies:
**5** - Views:
**7916**

### Re: Repeating Decimal and Prime Number

Hello jaap, Thank you for the great reminder: Long division! With input from you and v6ph1, plus two more hours of pencil and paper calculation, I finally get it. This is how I can reason about the phenomenon: 1. Let's visualise 10^N in form of 10^N = P * Quotient + Reminder. Consider P = 7 which is...

- Fri Dec 15, 2017 4:59 pm
- Forum: Number
- Topic: Repeating Decimal and Prime Number
- Replies:
**5** - Views:
**7916**

### Re: Repeating Decimal and Prime Number

It's a directly follows fermat's little theorem: 10^(p-1) == 1 (mod p) I feel embarrassed to admit: I could not see / understand why 10^(p-1) == 1 (mod p) is the reason, even after reading about introductory number theory in these day. I encounterd some congruences such as "Wilson's theorem" but ye...

- Tue Dec 12, 2017 10:03 am
- Forum: Programming languages
- Topic: New Preferred Programming Language Requests
- Replies:
**159** - Views:
**68965**

### Re: New Preferred Programming Language Requests

Hello all, Quite a discussion. As time goes by I find that choosing one language category (my choice: APL/J/K) cannot accurately describe the tool set I use. As example, I just solved and re-solved problem 093 (arithmatic expression), using a basket of language / tool in pipeline. Here's how: 1. Pro...

- Tue Dec 12, 2017 9:39 am
- Forum: Resources
- Topic: ProjectEuler in Persian
- Replies:
**2** - Views:
**6851**

### Re: ProjectEuler in Persian

I wish I can do Persian too!

- Fri Dec 08, 2017 12:15 pm
- Forum: News, Suggestions, and FAQ
- Topic: In Response to Problem Thread of 076
- Replies:
**6** - Views:
**1970**

### Re: In Response to Problem Thread of 076

Hello hk,

I concur and to demonstrate my determination, my github repo for PE solution has been removed.

Surely I do encourage other contenders to do the same.

Thanks for your advice and now it's time for me to stop mumbling and move on and enjoy the math and coding again.

Jim

I concur and to demonstrate my determination, my github repo for PE solution has been removed.

Surely I do encourage other contenders to do the same.

Thanks for your advice and now it's time for me to stop mumbling and move on and enjoy the math and coding again.

Jim

- Wed Dec 06, 2017 9:41 am
- Forum: News, Suggestions, and FAQ
- Topic: In Response to Problem Thread of 076
- Replies:
**6** - Views:
**1970**

### Re: In Response to Problem Thread of 076

Hello traxex, euler, Thank you for your kind response and encouragement. Might be I have been taking other people's dishonesty too seriously - after all it is not me losing a chance for learning new math skill. To math mortals like me, generating function is truly a genius way to solve partition cou...

- Tue Dec 05, 2017 6:45 pm
- Forum: News, Suggestions, and FAQ
- Topic: In Response to Problem Thread of 076
- Replies:
**6** - Views:
**1970**

### In Response to Problem Thread of 076

Dear all, I cannot stop myself sharing with you my post in the question thread. It appears people's moral has changed quite a lot in 2017: <begin> Does someone really regard himself having the problem solved by looking at partition(100) in Wikipaedia and then subtract one from it????? I can safely g...

- Sat Oct 14, 2017 6:44 pm
- Forum: Programming languages
- Topic: APL
- Replies:
**3** - Views:
**6634**

### Re: APL

Hi,

I come a few years late... Just solved 070 using NARS2000 and sometimes Dyalog APL.

At first I only wanted to learn APL via PE questions. Now it is the mathematics that keeps me going.

Jim

I come a few years late... Just solved 070 using NARS2000 and sometimes Dyalog APL.

At first I only wanted to learn APL via PE questions. Now it is the mathematics that keeps me going.

Jim

- Fri Sep 29, 2017 4:22 pm
- Forum: Number
- Topic: Repeating Decimal and Prime Number
- Replies:
**5** - Views:
**7916**

### Repeating Decimal and Prime Number

Hi, Just solved problem 026 which was the only obstacle to my flawless-fifty. I know this has been dimly mentioned in problem clarification section, but I can't suppress the excitement of discovering this: For some prime number P below 1000, 1/P gives repeating decimal where the length of repeating ...