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Math Supercomputing Science

Distributed.net Finds Optimal 25-Mark Golomb Ruler 265

Posted by timothy
from the unique-and-in-duplicate dept.
kpearson writes "Distributed.net's 8-year-old OGR-25 distributed computing project has just proven conclusively that the predicted shortest 25-mark Golomb ruler is optimal. 'The total length of the ruler is 480, with marks at positions: 0 12 29 39 72 91 146 157 160 161 166 191 207 214 258 290 316 354 372 394 396 431 459 467 480. (This ruler may alternatively be expressed in terms of the distance between those positions, which is how dnetc displays them: 12-17-10-33-19-...).' 124,387 people participated in the project and two people found the shortest ruler, one on October 10, 2007 and the other on March 24, 2008."
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Distributed.net Finds Optimal 25-Mark Golomb Ruler

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  • by Anonymous Coward on Saturday October 25, 2008 @10:06PM (#25513891)

    distributed.net used to have a very vibrant community, with several projects on-going at one time. But lately, things haven't been going so well for them. The prize funds for their RC5-72 challenge were recently yanked. And the only other project they had on-going was this OGR-25 project.

    Does anyone know if they'll offer further projects in the near future? Many people I know have moved on to BOINC-based [berkeley.edu] distributed computing projects, instead of sticking with distributed.net.

  • Every number I plugged in could be measured as a length between 2 numbers in that set. But according to wikipedia, no perfect ruler exists for over 5. And this has 25. So it's not perfect.

    So does anyone have a list of numbers that can't be measured as distances between these? I'd rather not calculate it myself.

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