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#1 2016-02-23 22:07:42
- kyr_leo
- Member
- Registered: 2016-02-23
- Posts: 6
Arrange numbers
Can you arrange numbers 1 to 11 on a circle, in such a way that the sum of every two consecutive numbers is a prime number? Is it possible?
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#2 2016-02-24 02:12:34
- Monox D. I-Fly
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- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000
Re: Arrange numbers
1-4-3-8-5-6-7-10-9-2-11-1
No, it is not because there are odd amount of numbers thus at least a pair of them would result in the multiple of 2.
Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.
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#3 2016-02-24 02:21:35
- kyr_leo
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- Registered: 2016-02-23
- Posts: 6
Re: Arrange numbers
Agree! What about the numbers 1 to 16?
12
5
14
9
4
7
6
13
16
15
8
3
10
1
2
11
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#4 2016-02-24 13:55:57
- Monox D. I-Fly
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- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000
Re: Arrange numbers
That's impressive, I tried to continue using the 1-4-3-8-5-6-7-10-9-2-11 above and gave up.
Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.
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