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2003-08-09, 07:28
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#34 |
Sep 2002
Vienna, Austria
110110112 Posts |
78557 is the smallest(?) Sierpinski Number(value of k such that k*2^n+1 is always composite)
"Seventeen or bust" is trying to prove that 78557 REALLY IS the smallest one...... 2525215(again) |
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2003-08-09, 10:49
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#35 |
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Jun 2003
1008 Posts |
The Composite cofactors of Fermat numbers F(23) has 2525215 digits :)
31536000 |
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2003-08-09, 16:25
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#36 |
Sep 2002
22×3×5 Posts |
31536000 = number of seconds in 365 day year..
142857 |
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2003-08-09, 17:31
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#37 | ||
Aug 2002
Rovereto (Italy)
9F16 Posts |
Quote:
142857 x 2 = 285714 Study those numbers carefully. What do you notice? Hopefully you noticed that both numbers contain the same digits: 1,2,4,5,7, and 8. If you were looking carefully, though, you may have noticed something truly amazing: not only does the second number use the same digits, it uses them in the same order! Okay, so that's mildly amusing...is that the only trick it does? Oh, no! We're just getting started! 142857 x 3 = 428571 142857 x 4 = 571428 142857 x 5 = 714285 142857 x 6 = 857142 In each case, the result of the multiplication uses the same digits, in the same order as the original number. But why stop at six? Why not multiply by seven? Okay... 142857 x 7 = 999999 Amazingly, the tricks don't stop there, either. Watch what happens when you multiply by eight... 142857 x 8 = 1142856 This doesn't look exactly like the original number, but if you take the first digit off the front of the answer, and add it to the last six digits, look what happens: 1 + 142856 = 142857 http://www.articlesforeducators.com/math/000002.asp Quote:
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2003-08-09, 17:32
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#38 |
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Aug 2002
Rovereto (Italy)
3×53 Posts |
I forgot my number...
... 83172 ;)
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2003-08-09, 19:21
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#39 | |
Sep 2002
Austin, TX
3×11×17 Posts |
Quote:
 Ding! Ding! Ding! Ding! DING! Simple, but so many alternatives :D . But, good job asdf. I didn't know 2^17th would fit as well :D . again ... 83172 |
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2003-08-09, 22:17
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#40 |
"Mike"
Aug 2002
25·257 Posts |
Well, any ordinary memory stick is going to be arranged in powers of 2...
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131082, 262144, 524288, 1048576, etc. (I can't remember beyond this!) Anyways... 83172 |
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2003-08-11, 04:30
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#41 |
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Aug 2003
32 Posts |
83172 = The area code for Astana, Kazakhstan. :D
Here are two numbers (there's a reason I list two): 12,285 and 14,595 BP 0001 |
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2003-08-11, 05:49
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#42 |
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Jun 2003
26 Posts |
Here is an answer (not very good
 ops: ) :12285=3*5*7*13*9 14595=3*5*7*139 ;) 1855 |
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2003-08-11, 13:39
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#43 |
Dec 2002
Frederick County, MD
2·5·37 Posts |
1855, the year Gauss passed away.
37 |
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2003-08-14, 14:39
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#44 |
"Sander"
Oct 2002
52.345322,5.52471
29×41 Posts |
37 Normal body temperature in Celcius.
130816 |
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