Gah, now I need to relearn the binary expansion of the largest known prime number...

I saw this quick article when someone linked the new M49 post on phys.org:
[URL="http://phys.org/news/2010-05-sum-digits-prime-evenly.html"]http://phys.org/news/2010-05-sum-digits-prime-evenly.html[/URL]

So we are currently at 21 even and 28 odd digit sums for the 49 Mersenne Primes.Amazingly M2203 and M2281 have the same digit sum: 3106!

The digit sum of M74207281 is 100,537,543, so at least something broke 100M :smile:
The most frequent digit is 5 at 2236279 (10.0108%) and the least frequent digit is 3 at 2232135 (9,9923%).


[CODE] digitsum
M1: p=2 3 prime
M2: p=3 7 prime
M3: p=5 4
M4: p=7 10
M5: p=13 19 prime
M6: p=17 13 prime
M7: p=19 28
M8: p=31 46
M9: p=61 73 prime
M10: p=89 112
M11: p=107 139 prime
M12: p=127 154
M13: p=521 697
M14: p=607 847
M15: p=1279 1675
M16: p=2203 3106
M17: p=2281 3106
M18: p=3217 4258
M19: p=4253 5755
M20: p=4423 5950
M21: p=9689 13216
M22: p=9941 13693 prime
M23: p=11213 14980
M24: p=19937 27202
M25: p=21701 28939
M26: p=23209 31339
M27: p=44497 60337 prime
M28: p=86243 116455
M29: p=110503 149365
M30: p=132049 179488
M31: p=216091 291745
M32: p=756839 1026544
M33: p=859433 1163443
M34: p=1257787 1704376
M35: p=1398269 1893388
M36: p=2976221 4038358
M37: p=3021377 4092673
M38: p=6972593 9440671
M39: p=13466917 18243946
M40: p=20996011 28445131
M41: p=24036583 32580433
M42: p=25964951 35170384
M43: p=30402457 41201947
M44: p=32582657 44142151
M45: p=37156667 50349694
M46: p=42643801 57766339
M47: p=43112609 58416637
M48: p=57885161 78434761
M49: p=74207281 100537543

21 even 28 odd[/CODE]

[QUOTE=Madpoo;423432]...
We'll know more about the attrition rate of these new assignments over the next few weeks/months.[/QUOTE]

For now I'm going to create a couple fun graphs.

Right now I've added a graph showing new user counts per hour for the past 7 days... the same basic setup as the TFLOP/s graph.

Check it out here (I may be tweaking this page here and there, so I apologize in advance if I break it temporarily):
[URL="http://www.mersenne.org/primenet/default.mock.php"]http://www.mersenne.org/primenet/default.mock.php[/URL]

Depending on if they're useful or not I may roll these into the actual page (not just the "mock" or beta version of the page).

It would be nice if the TFLOP/s graph had the bottom fixed at 0 and not floating.

[QUOTE=Mark Rose;423441]It would be nice if the TFLOP/s graph had the bottom fixed at 0 and not floating.[/QUOTE]

That's come up before, but it really doesn't add much and tends to lose detail based on the size of the graph itself. It would just be a bunch of dead space.

It's curious that for the new graph I added, it actually has a base of -100 right now. Odd. I'll have to dig into the Google graphing API and see if you can even adjust the base or if it's just auto-assigned based on your data.

[QUOTE=Madpoo;423442]That's come up before, but it really doesn't add much and tends to lose detail based on the size of the graph itself. It would just be a bunch of dead space.[/quote]

Right now it's kind of useless, since you can't tell the relative change. Like if it moves 10 pixels, how much is that? You can't tell without checking where the x-axis decided to be today.

I guess it's a pet-peeve of mine. I have several dozen graphs in view from my desk, and they all have their bottom range at 0, so I can see where things are :)

[QUOTE=lavalamp;423396]I must admit that when I first learned of the GIMPS project, I did wonder why such an ... unfortunate accronym was used. Somewhat like the chosen name for the 7th planet in our solar system.[/QUOTE]

Re. the 7th planet, nothing unfortunate about it in the original Greek, nor in the preferred English pronunciation, YOUR-uh-nuss. It's only when one slips into Hicksville (e.g. 'them thar evil eye-raynians say their nucular program is in support of a future nucular-powered space probe to Your anus') that things sound risible.

.

[QUOTE=Mark Rose;423443]Right now it's kind of useless, since you can't tell the relative change. Like if it moves 10 pixels, how much is that? You can't tell without checking where the x-axis decided to be today.

I guess it's a pet-peeve of mine. I have several dozen graphs in view from my desk, and they all have their bottom range at 0, so I can see where things are :)[/QUOTE]

Well... whatever. :smile:

I set the mockup version to have a baseline of zero for now... it just compresses the vertical data even more. I'm still not convinced it's any better. It's only use is for a quick eyeball to see changes over the previous week and I'm not sure a baseline of zero contributes to that at all.

Other opinions out there?

[QUOTE=ewmayer;423446]that things sound risible.[/QUOTE]

Channeling my inner D: [url]https://www.youtube.com/watch?v=2K8_jgiNqUc&t=03m06s[/url]

[QUOTE=M29;423416]I recall George saying "OK, as long as you don't call it Woltman's Internet Mersenne Prime Search".
[/QUOTE]

So GIMPS really stands for "George's Internet Mersenne Prime Search"?

So George is user id 4 on the forum. There is one before him.

[url]http://www.mersenneforum.org/member.php?u=3[/url]