[QUOTE=jcrombie;344078]Thanks, but someone :bow wave: is already submitting the opn numbers.:smile:

(And that emoticon is really ironic today, considering the name of the major river flooding my city today.)[/QUOTE]
Yes, I coordinate with William Lipp. And all my results are in factordb.com.
I factor a lot of these numbers.

[QUOTE=lorgix;344116]Yes, I coordinate with William Lipp. And all my results are in factordb.com.
I factor a lot of these numbers.[/QUOTE]

Sorry lorgix, that was a rather low quality post earlier. I should of been a lot more explicit.

Firstly, I'm currently the maintainer of Prof. Brent's lists, and if you have any questions or new factors you can contact me.

That being said, I've noticed that opn numbers are actually making their way over and I'm presuming that is William Lipp's work. Therefore, people may submit opn factors if like, but if they don't, then it's probably not a big deal thanks to William :smile:.

[QUOTE=jcrombie;344140]Sorry lorgix, that was a rather low quality post earlier. I should of been a lot more explicit.

Firstly, I'm currently the maintainer of Prof. Brent's lists, and if you have any questions or new factors you can contact me.

That being said, I've noticed that opn numbers are actually making their way over and I'm presuming that is William Lipp's work. Therefore, people may submit opn factors if like, but if they don't, then it's probably not a big deal thanks to William :smile:.[/QUOTE]
Thanks for the clarification, and for carrying on the collecting of factors.

I frequently go to your site for the Aurifeuillian LMs & Primitives. Very handy.

1861^61-1
 

From the [URL="http://oddperfect.org/composites.html"]Composites Page[/URL].
The remaining [URL="http://factordb.com/index.php?id=1100000000378838696"]cofactor[/URL] has a very nice split:

[CODE]prp70 = 4086393360143066057267331586088697028903596229789836059125728810530381
prp70 = 4484429163934011878843076384908110337260071297597350835845994396139199[/CODE]

I'll take C140 1877^61-1 next.

1877^61-1 splits as:
[CODE]prp67 = 2140676404221189856345125137432941507034773231283759191684109806967
prp74 = 21978675312114416652130107106979837297108118522493340902563705597430243063[/CODE]Not as sweet as the last but still nice.

Another very nice split on the [URL="http://oddperfect.org/composites.html"]Composites Page[/URL].

1255259^29-1
[CODE]prp73 = 4945990578155491485880746936573857237963194245890523917873898104079944387
prp74 = 32009137966179446850639927905075091503777514311201601852733994014604325839[/CODE]

At Number 20 on Pascal's Most Wanted list:

2801^151-1 by yoyo@home user sprking
2069839062953898821206671651167228272177938177737

2801 is sigma(7^4), so powers of 2801 are common in the factor chains. It used to be a particularly troublesome branch of the factor chains because there were many members with no known factors. 157 is now the only exponent in the range of current interest with no known factors.

At Number 22 on Pascal's Most Wanted list:

7^619-1 by yoyo@home Crystal Pellet
219066690927979556642252621197865698883119903

Yoyo's pass into the next layer continues to payoff. A P51 for #25 on Pascal's Most Wanted List by yoyo participant Mr. Hankey

(11016462577051^23-1)/11016462577050
759031935006566598155761570858834819868251630398193

Several "relatively" easy ones from t600.txt by SNFS.

[CODE]681431768085039523^11-1
prp53 factor: 28781213149851037201920908516427900816402138303993403
prp71 factor: 31400209254952059398130700040325507367536506766327019624039724187805403

18434671564671991^11-1
prp63 factor: 109694146902242776086116052765379907461896871724772588540010763
prp65 factor: 26698270594313966814283675411405281909895455963528867704991247543

34910890042656523169^11-1
prp51 factor: 272593037377022299754472036927425090021728764624317
prp83 factor: 53013436666232460820240389854293753229009118528543634568018993056879443490906854383

16917208542442398371^11-1
prp48 factor: 365769436074452096798203170401956084211102867129
prp86 factor: 59505470683819456588987417138761820543553622471766884837590828613381785864102598544217

1833183389353887829^11-1
prp62 factor: 39597644481535394362904774265727561521152289667420189478077973
prp75 factor: 114571558511618359120444577540492640542836528252353371191459312142075082409

1512757364755397741^11-1
prp61 factor: 1690259577946619522782850808560548152123508790351127681552127
prp76 factor: 4424141682130979207272489028519111467592675254168138372595671633662503863763

22987759093064683^11-1
prp66 factor: 680017309650212959824867228969000172671931471867529416185906429161
prp77 factor: 19090258074630262577761318881093458982598289240529571908586850098332649843921[/CODE]

[QUOTE=RichD;363533]Several "relatively" easy ones from t600.txt by SNFS.[/QUOTE]

A few more but the last post and this post refers to t800.txt - not t600.
[CODE]23776383686656747^11-1
prp60 factor: 382539231961505436060374829960501910399158727676683224869477
prp88 factor: 1463392398700918071578167677416017982256966611498909683223839404054833100129488782316477

261142645694888227909^11-1
prp44 factor: 44118347675746494149429175586747537698998767
prp51 factor: 261095813142283809643499802972642146086102270504493
prp53 factor: 84194181605868941625821742548762135144314083342049871

88770666332610762169^11-1
prp73 factor: 1135324329177494861892633592456954791042674717072657551286237506037682197
prp78 factor: 122276653119139818813286739084137694169669433949270330149094971137747369328769

30944468620811041861^11-1
prp53 factor: 39691384370808836940486006947030432673849936663639821
prp100 factor: 2041042498430562792878460704971648551143833689440155361510588194933847840494398332105617301928873791[/CODE]