10-27-2004, 09:29 AM | #1 (permalink) |
Junkie
Location: France
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The cool numbers thread.
OK. To start it off, and give credit, I read this book by french author Bernard Werber(who obvioulsy did not find this info himself, but w/e).
This is an interesting random cool number I found in it. 142 857 (or, for americans...142,857) let's start by multiplying this number by 1, 2, 3, 4, 5, and 6.... 142 857 x 1 = 142 857 ....(obvioulsy) 142 857 x 2 = 285 714 142 857 x 3 = 428 571 (hmm..) 142 857 x 4 = 571 428 (hmmmmmmmmmmm.....) 142 857 x 5 = 714 285 142 857 x 6 = 857 142 OK. To those of you who haven't noticed, the results have exactly the same numbers, but it seems the order has been shifted each time...cool right?? But wait. It's not over... 142 857 x 7? . . . 999 999!!! Strange, huh?.... especially when.. 142 + 857 = 999 and, oh wait... 14 + 28 + 57 = 99 142 857 square, or 142 857^2 = 20408122449 and 20408 + 122449 = 142 857 cool right? Last edited by biznatch; 10-27-2004 at 02:45 PM.. Reason: typo...sorry guys |
10-27-2004, 10:07 AM | #4 (permalink) |
Tilted
Location: Singapore
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Wow, that's really interesting! The sheer concidence, or is it? Hmm...
Thanks for sharing, I probably never would have known this otherwise. I can only guess at the amount of research that went into it. Is there any other number with similar properties? Is there a name for such a number? /reminds myself to read this up. |
10-27-2004, 02:40 PM | #8 (permalink) |
Baltimoron
Location: Beeeeeautiful Bel Air, MD
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Actually, 142,857 x 9 = 1,285,713...
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"Final thought: I just rented Michael Moore's Bowling for Columbine. Frankly, it was the worst sports movie I've ever seen." --Peter Schmuck, The (Baltimore) Sun |
10-28-2004, 10:42 AM | #11 (permalink) |
Psycho
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All numbers are "cool numbers."
Proof: 1. Assume that not all numbers are cool. 2. Divide the numbers into the set of cool numbers and the set of not-cool numbers. 3. Now, consider the set of not-cool numbers. One of them is less than all of the others, which means it is the lowest not-cool number in the universe! Hey, that's pretty cool. Move it to the cool number set. 4. Repeat step 3 until the not-cool set is empty. This means that all numbers are cool, QED. |
10-28-2004, 11:56 AM | #12 (permalink) |
Sky Piercer
Location: Ireland
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A book that you be interested in is "Curious and Interesting Numbers" by David Wells.
It has a whole load of numbers, all put in numerical order, so its almost like a number dictionary. Opening it at random i find things such as: 371 = 3<sup>3</sup> + 7<sup>3</sup> + 1<sup>3</sup> 12,321 = 111<sup>2</sup>, also 1,234,321 = 1111<sup>2</sup>, etc. 3,628,800 Equal to 10! and the only factorial that is the product of other consecutive factorials (apart from the trivial ones involving 1!). 10! = 6! * 7! 10! also equals 3! * 5! * 7!. These examples are all very short, but some of the explainations go on for paragraphs or even pages (esp. pi, e, phi, etc.). Interesting book, but not exactly cover to cover reading!
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10-28-2004, 01:30 PM | #13 (permalink) |
Psycho
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To prove: 0.9 repeating = 1
[proof follows below] 1. let x = 0.9 repeating 2. multiply each side by ten, giving 10x = 9.9 repeating 3. subtract x from the left, 0.9 repeating from the right, giving 9x = 9 4. divide both by nine, giving x = 1 5. yet x = 0.9 repeating 6. therefore 0.9 repeating = 1 ehh, I didn't relize there was a thread on this. I apologize for my ignorance. |
10-29-2004, 08:26 AM | #14 (permalink) | |
Tilted
Location: Singapore
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Quote:
Did you think that up yourself? |
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11-01-2004, 08:21 AM | #15 (permalink) | |
Psycho
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Quote:
Martin Gardner column in Scientific American — originally phrased as a proof that there are no "uninteresting" numbers. |
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11-01-2004, 05:40 PM | #16 (permalink) |
Insane
Location: Saskatchewan
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The coolest number of all of course is "42".
For those of you for whom this makes no sense, I refer you to "The Hitch-hiker's Guide to the Galaxy" by the late Douglas Adams.
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"Act as if the future of the universe depends on what you do, while laughing at yourself for thinking that your actions make any difference." |
11-01-2004, 05:41 PM | #17 (permalink) | ||
Tilted
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Quote:
Quote:
9 is probably the most interesting number i know. Last edited by daking; 11-01-2004 at 05:46 PM.. |
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11-02-2004, 02:17 AM | #18 (permalink) | |
Upright
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Quote:
Aye! that's a most interesting read!! i strongly recommend it to anyone. It's actually a trilogy in four parts. Excellent stuff. |
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11-07-2004, 02:30 AM | #21 (permalink) |
Crazy
Location: San Diego, CA
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The original post is indeed interesting, but it is also mere coincidence. Let me state a couple reasons:
1) Everything done to the number is dependent that it is base 10. Numbers, by definition, are base-less, and we use bases simply to express them. This means that there is most probably a number in every other base that fits this property, but is also probably not the same number. 2) If I came up with a number of random properties that would be "cool" I could use simple algebra and/or my computer to find a number that fit those properties, then post it around the internet as if it were a neat find. Is it really that cool, though? Not really very useful, if you ask me. Sorry if this ruined the mood of the post. As I said, I think it's a pretty neat number, but from a mathematics theory standpoint, not a very useful find.
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11-07-2004, 01:16 PM | #23 (permalink) | |
Squid
Location: USS George Washington
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Quote:
10101010 x 10101010 = 10203040 What it really equals is 102030403020100. -Mikey |
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11-16-2004, 07:43 AM | #28 (permalink) | |
Tilted
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Quote:
Code:
11 x11 --------- 11 11 -------- 121 11*11 = 11*1 + 11*10 = 121 111*111 = 111*1 + 111*10 + 111*100 = 12321 Last edited by ergdork; 11-16-2004 at 07:46 AM.. |
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11-23-2004, 12:27 AM | #29 (permalink) |
Crazy
Location: London, UK
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Not particularly scientific, but...
take a calculator key-pad. any 3 digit number pattern added to the pattern "reflected" through the centre of the keypad gives the same answer, 1110. For example, 789 + 123, 654 + 456, 147 + 963 Slightly more interesting: 748 + 362 |
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cool, numbers, thread |
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