## Search found 115 matches

Tue Jul 10, 2007 8:35 am UTC
Forum: Forum Games
Topic: Math game!
Replies: 36
Views: 8366
1. The nth term in the sequence is 69874472491462 modulo the nth prime number: 69874472491462 = 0 mod 2 69874472491462 = 1 mod 3 69874472491462 = 2 mod 5 etc. The sequence is 0, 1, 2, 2, 1, 2, 1, 2, 1, 3, 2, 0, 1 , 25, 31, 43... (Note that I chose the next number to be small to keep the game interes...
Mon Jul 09, 2007 11:09 pm UTC
Forum: General
Topic: INTRO THREAD 2.0: INTRODUCE YOURSELF OR PERISH!
Replies: 2548
Views: 329108
Re the SOHCAHTOA story: my maths teacher never used mnemonics, it was all rote learning. One of his favourite excercises was the 'three minute test'. We had three minutes to fill in a sheet with all the various trig identities. I don't know that it helped me much, since most of them can be derived f...
Mon Jul 09, 2007 10:51 pm UTC
Forum: Logic Puzzles
Topic: I dare you to solve this.
Replies: 82
Views: 35786
When it says number 12 is wrong, it's telling you that at that point your answers are not consistent, becasue you haven't answered an even number of questions with consonants. It doesn't mean the answer is not A.
Mon Jul 09, 2007 12:01 pm UTC
Forum: General
Topic: Dial Dillema
Replies: 44
Views: 5012
Intelligence doesn't make someone arrogant. It just means that they have greater potential, and other factors would determine whether they put their brain to good use. As a parent, I would want my child to have all the help they can get.
Mon Jul 09, 2007 11:52 am UTC
Forum: General
Topic: Dial Dillema
Replies: 44
Views: 5012
I would give intelligence 10 and beauty 4. But what about things like perserverence? I would rate that higher than intelligence.
Mon Jul 09, 2007 11:37 am UTC
Forum: Forum Games
Topic: Guess The Next Poster
Replies: 23681
Views: 1848481
I was too late. pollywog is next.
Mon Jul 09, 2007 11:26 am UTC
Forum: Forum Games
Topic: Count to one thousand
Replies: 379
Views: 58130
Mr Mouffles, I have a problem with your sig. Wouldn't a 5x5x5x5x5 Rubik's Cube cease to be a cube? It's a higher dimensional cube. Or maybe I should change it to the 5x5x5x5x5 Rubik's Hypercube? Next is 69 in hexadecimal.  3x3x5 Rubik's Cube 'Rubik's Cube' decribes the puzzle, in all its diff...
Mon Jul 09, 2007 11:20 am UTC
Forum: Forum Games
Topic: Questions only
Replies: 965
Views: 117451
Wasn't it something to do with elephants?
Mon Jul 09, 2007 9:20 am UTC
Forum: General
Topic: Three Wishes
Replies: 91
Views: 11187
Invisible Queen wrote:And thirdly, I wish the genie back to the bottle. If you don't do that their uncontrollable power will destroy the world.

I would wish for the genie to self-destruct. You never know who might find it next.
Mon Jul 09, 2007 8:37 am UTC
Forum: Forum Games
Topic: Count to one thousand
Replies: 379
Views: 58130
First three digit multiple of three.
Mon Jul 09, 2007 8:12 am UTC
Forum: Forum Games
Topic: Guess The Next Poster
Replies: 23681
Views: 1848481
Foiled. But I also think Kit.
Mon Jul 09, 2007 7:47 am UTC
Forum: Forum Games
Topic: Guess The Next Poster
Replies: 23681
Views: 1848481
Another post completely out of the blue. I say DarkWerewolf again.
Mon Jul 09, 2007 7:42 am UTC
Forum: Forum Games
Topic: Questions only
Replies: 965
Views: 117451
What happened to the rollercoaster, anyway?
Mon Jul 09, 2007 7:36 am UTC
Topic: 0287: "NP-Complete"
Replies: 191
Views: 36500
It's interesting that if the total had been \$15.00 or \$15.10, the problem would have a unique solution.
Mon Jul 09, 2007 4:21 am UTC
Topic: 0287: "NP-Complete"
Replies: 191
Views: 36500
chessguy wrote:That is:
1 Mixed Fruit, 2 Hot Wings, 1 sampler plate, or

You beat me to it. I just came up with the same answer.
Mon Jul 09, 2007 4:09 am UTC
Topic: 0287: "NP-Complete"
Replies: 191
Views: 36500
But only three people at the table. I say a sampler plate, two hot wings, and one mixed fruit.
Sun Jul 08, 2007 11:02 pm UTC
Forum: Forum Games
Topic: Math game!
Replies: 36
Views: 8366
2

The differences between consecutive primes are
0, 1, 2, 2, 4, 2, 4, 2, 4, 6, 2, 6, 4...
(Defining the first difference to be 0)

Now subtract 3*floor(d/4), where d is each difference.

So we get
0, 1, 2, 2, 1, 2, 1, 2, 1, 3, 2, 3, 1...
Sun Jul 08, 2007 10:32 pm UTC
Forum: General
Topic: The last time you used windows 95
Replies: 26
Views: 3112
I used the hard drive disc carrying it as a mirror. Still do, in fact. It's very shiny.
Sun Jul 08, 2007 12:10 pm UTC
Topic: Define Time!
Replies: 10
Views: 2633
265 the first time, 530 after three or four more tries.
Sun Jul 08, 2007 9:25 am UTC
Forum: Logic Puzzles
Topic: Subdivisions of Rectangles [solution]
Replies: 15
Views: 4516
It's not an if-and-only-if: a rectangle with sides lined up with the checkerboard can cover an equal amount of black and white area without having a side of even integer length. Even integer length implies equal area, but not vice versa. That's true. My mistake. I have just found a better explanati...
Sun Jul 08, 2007 2:53 am UTC
Forum: Forum Games
Topic: Count to 1 1000 times!
Replies: 1000
Views: 165736
-e^(i*pi)
Sun Jul 08, 2007 1:50 am UTC
Forum: Forum Games
Topic: Count to one thousand
Replies: 379
Views: 58130
1/(0.01 + 0.001 + 0.0002 + 0.00003 + 0.000005 + ...)
(Fibonacci numbers)

EDIT: 87 was posted twice, so I'll do 88 as well - the year BC of the first Roman Civil War.
Sun Jul 08, 2007 1:42 am UTC
Forum: Logic Puzzles
Topic: Subdivisions of Rectangles [solution]
Replies: 15
Views: 4516
Maybe I'm not explaining this very well. The key point is that if a rectangle has an even side and is parallel to the grid, then it covers equal areas of black and white no matter where it is on the grid or which way it is oriented. Any neighbouring rectangles and their orientation is irrelevant: we...
Sun Jul 08, 2007 1:23 am UTC
Forum: Forum Games
Topic: Word Association Game 2: Electric Boogaloo
Replies: 12812
Views: 1049402
bedroom
Sun Jul 08, 2007 1:20 am UTC
Forum: Forum Games
Topic: Count to one thousand
Replies: 379
Views: 58130
57 (in base 16)
Sun Jul 08, 2007 1:10 am UTC
Forum: Logic Puzzles
Topic: Subdivisions of Rectangles [solution]
Replies: 15
Views: 4516
This solution is actually flawed... the rectangles inside need not have its 'even' sides parrallel to the outer rectangle, and because of this your proof falls apart... sry The rectangles inside have sides parallel to the outer rectangle, so they have sides parallel to the grid (and hence an even s...
Sun Jul 08, 2007 12:08 am UTC
Forum: Forum Games
Topic: Math game!
Replies: 36
Views: 8366
1

The number of 1's in this sequence:
97, 105, 112, 119, 125, 131, 136, 141, 145, 149, 152...
(Add 8, 7, 7, 6, 6, 5, 5...)

The sequence is 0, 1, 2, 2, 1, 2, 1, 2, 1, 1, 1...

(I'll leave modulo 3 for the next person)
Sat Jul 07, 2007 11:29 pm UTC
Forum: Logic Puzzles
Topic: Subdivisions of Rectangles [solution]
Replies: 15
Views: 4516
I have another solution for part (b). Start with an infinite grid coloured like a chessboard. Then take the large rectangle, double all the lengths so that all integral lengths become even lengths, and place it at the origin, with the sides parallel to the grid. Then it is easy to prove (but hard wi...
Sat Jul 07, 2007 11:54 am UTC
Forum: The Help Desk
Replies: 436
Views: 74833
This is not really a problem, but it's still interesting. If I turn on my laptop and then plug my wireless mouse into the USB port, the laptop ALWAYS freezes while booting up. If I wait a few seconds this never happens. Very strange. Any ideas as to what could cause this?
Sat Jul 07, 2007 10:39 am UTC
Forum: General
Topic: INTRO THREAD 2.0: INTRODUCE YOURSELF OR PERISH!
Replies: 2548
Views: 329108
pollywog wrote:
keithc wrote:
sheepster wrote:Evenin' guys. I'm sheepster and I'm Welsh.

Well, with a name like sheepster it was either Welsh or Kiwi

Mouffles wrote: I'm 18, male, currently studying Mechatronics at Auckland Uni.

Careful. We're getting stronger.

Go the Kiwis!
Sat Jul 07, 2007 9:02 am UTC
Forum: Forum Games
Topic: Math game!
Replies: 36
Views: 8366
2 Start with the sequence 1, 2, 21, 212, 21221, 21221212... Then our sequence is the number of distinct prime factors. 1 = 1 (0 factors) 2 = 2 (1 factor) 21 = 3*7 (2 factors) 212 = 2^2*53 (2 factors) 21221 is prime The next number has 2 distinct prime factors The one after that has 3 distinct prime ...
Sat Jul 07, 2007 7:30 am UTC
Forum: General
Topic: Umm....math? (previously a hard question)
Replies: 14
Views: 2183
Of course it's yes. The Riemann Hypothesis is awesome.
Fri Jul 06, 2007 10:50 pm UTC
Forum: General
Replies: 81
Views: 10253
153
153=1^3+5^3+3^3
153=1!+2!+3!+4!+5!
...and heaps of other cool properties.
Fri Jul 06, 2007 9:42 pm UTC
Forum: Mathematics
Topic: Annoying Riddle
Replies: 17
Views: 5015
I also came up with the same infinite product via a different method. To solve the original problem, we have to find a closed form expression for the product of 1-2/3^k, k from 1 to infinity. I suspect that this doesn't exist, since there is no neat expression for the product of 1-1/3^k, k from 1 to...
Fri Jul 06, 2007 9:33 pm UTC
Forum: General
Topic: INTRO THREAD 2.0: INTRODUCE YOURSELF OR PERISH!
Replies: 2548
Views: 329108
Hi everyone. I was introduced to xkcd a while ago and have just started reading the forums (or is it fora? or both?). I'm 18, male, currently studying Mechatronics at Auckland Uni. I don't really have anything interesting to say, but the mods seem to get angry at people who don't post here (please d...