Finally finished the C159 I reserved a while back (before I had an appreciation for the difficulty associated....):

[CODE]926513716887292859004458445037317799253715046100084035461177391399433630328199168528281706251416605798781855604797689913764042354836352980078000112186494434999[/CODE]

factors as:

[CODE]prp63 factor: 374201610988529864723814277308980795205850152052638447652095317
prp97 factor: 2475974687654919325326667451433200896862531787420118436941153237959138861197370115806993576080347[/CODE]

A couple from t500.txt

[CODE]483593153887747265029536907421^7-1
prp42 factor: 596970245860518355853175140566298521676041
prp52 factor: 2427047333075241349541882564808730146712612914820897
prp57 factor: 109638048846120873587841323016308171399152715785792539313

5751121849207819585780202063999542303315009^5-1
prp57 factor: 859755941344791000208146934205342584206725070496495518641
prp89 factor: 64215981071138978808686122409258281924273072536350250502804116023630105166642086135534821[/CODE]

A few from t600.txt

[CODE]14198034740741233771^11-1
prp67 factor: 1206570966487319212863382159059096951017153551136339380690178418841
prp68 factor: 74050602758240655822461863083123982724998075447635125810594066707321

14198034740741233771^11-1
prp56 factor: 13876982058596013557913276459924473872832530148055398917
prp82 factor: 1555265950696404199032530203009180164666940301833985419651520538096079446448079449

41293199973948915847^11-1
prp53 factor: 55155852948804011155183394046384168661878586989870911
prp87 factor: 603478724547172255060584598264751182327907078719697724512105378316546943992507352675879

596739358360224467441^11-1
prp52 factor: 1157195795341528134486364192184568567051191395164697
prp95 factor: 72414663410831673173319983137893764574325551127299732284916520668625142941034899136624233516141[/CODE]

I want to get involved in this. I had been getting lists of composites from wblipp, but he may have changed e-mail addresses lately. How do I figure out which composites are available to work on, and then reserve them?

William maintains a [URL="http://oddperfect.org/composites.html"]Composites Page[/URL] but that hasn't been updated in a timely fashion. My guess interest is drying up because the numbers are getting larger or he has real life problems that have a higher priority.

On his [URL="http://oddperfect.org/"]home page[/URL] there is reference/link to Pascal's site. I have recently been looking at the t-tables. Right now I am working on about 5 "small" composites in the Roadblock list with exponent=37 (or Sigma( n, 36 ) ).

I don't know what is the proper reservation protocol.

From Roadblocks list:

[CODE]22271^37-1
prp51 factor: 495180362328973971453454780993125679085755582946053
prp106 factor: 6666316556934368393690979348143850861547976277115308118436192568180768448656077977302664886482726105707469

21401^37-1
prp41 factor: 42487899667922138599799163620346689362853
prp116 factor: 18508935549292619800248645835997679980128055606567942896718154183894608504909104385616417348847040636099047682154929[/CODE]

A few more from Roadblocks list.

[CODE]21499^37-1
prp70 factor: 6619999997424047084407983922025734704423946002737752953751511488391897
prp87 factor: 140029507442258869791879285739342122631416184101071344425420492922673547186853658133233

21893^37-1
prp60 factor: 816534175975494799977163246238537834336787895227592990642621
prp97 factor: 2182908063015474999141208644440361647499539989411916310683763757996049747382925717651300069760881

22153^37-1
prp72 factor: 690682347202437226882554661137300765009394964988434429249845401026800271
prp85 factor: 3947416557993600493646847824671780226435864013644511018225928899598330275038820788411[/CODE]

C183
 

One of the easier ones from the most difficult Roadblock list.

9059^47-1
[CODE]prp65 factor: 24186106920344957819360826714782368729437103354872264054696711607
prp118 factor: 4387063485268149211713318512117780989246912840273258939867094014851261026712867467252776689093730045640797339546027603[/CODE]

From [URL="http://www.lirmm.fr/~ochem/opn/t1000.txt"]t1000.txt[/URL]

[URL="http://www.factordb.com/index.php?id=1100000000128167477"]48105532969151269777790678536224865597^7-1[/URL]

Remaining [URL="http://www.factordb.com/index.php?id=1100000000438445374"]C144[/URL] is fully factored:

[CODE]Found probable prime factor of 36 digits: 519189419890488256372845851391240347
Divisors found:
r1=263729051835294564916381272794085951982731259511 (pp48)
r2=3944008061202606945973318740081641862218786887568669721174167 (pp61)[/CODE]

C183
 

Another from the Roadblock list.

9137^47-1
[CODE]prp66 factor: 452562951366526226935829002163229601440509512542210824328608651269
prp117 factor: 347804568267265886181643888110883094959341242337355660703891289720289393389906105466802417788297404308920960660456723[/CODE]

C184
 

From Roadblock list.

9649^47-1
[CODE]prp91 factor: 3853515238302039886279521343282239444786679447850227297456374733782720742089998798653846961
prp93 factor: 501619054696505985477823283456842056836777243555020421300129960965684055592747371968666226191[/CODE]

From t1600.txt:

[CODE]37041807508701607291607847810013371143881950549744311267301792081875194566942545467319940552905391043=5455466874709281346756183088733319507030848748471*6789851053889048431940223794965089643902576402536533*
94540893622054934527516399015518492120526933348337229750171236472858666025392283487122736087699423029=2955360351571271986700473300650227273748655111*31989633200496352336442855552128664363509361982066336739*
37400710008398433168603968846853188999160241223909806575251437115925925875142716563481703863127529756374969=8913541555164334545416789578668471681066987187428588252469*4195942743625756824694059917977645600593091552501*
11567155483296761816130531270172571500799496461119593330266640279662240942497868206879430531250319625112925063=6975686627883148440160856893097773443401071804650519682363*1658210309657638232620930001595786356540007074532901*
19144048531962318654498171451355083049070256547714351470486413806922159602985519169336027686885238918709756111689=12208288350933660310741910632430855558904433474801*1568118968167902768400636857922840333028937680160836422883734489*[/CODE]