20030712, 17:47  #23  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}·3·641 Posts 
Quote:
Assuming the pivot is sufficiently frictionless, if the bulb contains a perfect vacuum, the white (or silvered, in some versions) side will move away from the light source, while the black side approaches it. If the bulb's vacuum is not perfect, then at some pressure range, the thermal transpiration effect dominates and the black side retreats from the light while the white/silvered side approaches it. This dual mechanism explains why many folks disagree on the direction of rotation. Two apparentlyidentical radiometers, sidebyside, could be rotating in opposite directions (I vaguely recall having seen that) because their internal pressures were in different ranges. See http://science.howstuffworks.com/question239.htm Regarding thermal transpiration, the results of Maxwell and Reynolds are described at http://math.ucr.edu/home/baez/physics/General/LightMill/lightmill.html Quote:
Quote:


20030715, 18:15  #24  
∂^{2}ω=0
Sep 2002
República de California
5·2,351 Posts 
Quote:


20030715, 19:27  #25 
Banned
"Luigi"
Aug 2002
Team Italia
3·1,619 Posts 
what about 2^41234123412341  1 ?
:D Luigi 
20030715, 20:25  #26  
∂^{2}ω=0
Sep 2002
República de California
5×2,351 Posts 
Quote:
M41234123412341 has 0 factors in [1.000000e+00, 1.208926e+24] Performed 667856158 trial divides Clocks = 00:27:13.761 1641.212u 0.002s 27:17.64 100.2% 0+0k 0+0io 116pf+0w Next thing you'll be telling us it's prime. :) 

20030715, 21:14  #27 
Jun 2003
3·7 Posts 
What is the continual beep coming from my computer ever since I finished my last number? The computer has not crashed because every thing is working fine

20030715, 21:38  #28  
"GIMFS"
Sep 2002
Oeiras, Portugal
2×5×157 Posts 
Quote:


20030715, 21:50  #29 
May 2003
443_{8} Posts 
Send that to George for verification, you may have a new prime number. Then again, could be a false positive. Only one way to know. :D

20030716, 00:13  #30  
Banned
"Luigi"
Aug 2002
Team Italia
1001011111001_{2} Posts 
Quote:
Well, I reached the same limit (1e+24) then the power went off and... :( Maybe I'll resume the search. But don't stay tuned too much! ;) Luigi 

20030724, 21:53  #31  
∂^{2}ω=0
Sep 2002
República de California
5·2,351 Posts 
Quote:
M41234123412341 has a factor: 10437279104937894533506183 Ernst 

20030725, 02:46  #32 
Jun 2003
2^{2}·61 Posts 
ewmayer, how the heck did you go upto 2^72 in only 10 minutes? Maybe you should talk to George and get the algorithm in your trial factoring program into the next version of prime95 :)

20030725, 04:59  #33 
Aug 2002
Richland, WA
2^{2}×3×11 Posts 
Factoring M395462042351 to 2^72 in 10 minutes is not significantly different from what Prime95 could do. Recall that factoring M395462042351 requires checking 5,000 times fewer factors than M79,300,000. Multiplying 10 minutes * 5,000 yields 34.7 days which is around how long others have said it takes Prime95 to factor M79,300,000 to 2^72.

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