From t450:

[CODE]139017523 23- 2.3.7.599.797.2347.4153.17389.10977809.12468899.39142085479009637521723396295529638672231.41646674412452735897184897406619858264064559.25748232980476728669179788413499714614116227099701144132002796981943031
22216443433 19- 2^3.3.2851.925685143.4374554726949981762538925611374885358307.29808109366707047660621057307646441249081.101885795140529802458647987578844526693651132078521.45894695443345071999784320229488711118451828794129379[/CODE]

(I'm not sure if I'm supposed to report these anywhere else.)

Jonathan

[Reply here, instead of original thread....]
[QUOTE=wblipp;288447]This number often shows up in wanted lists. I believe Joseph Chein solicited help with this more than five years ago, although I cannot find those posts. My records show 10,000 curves at B1=11e7 and 100 at 26e7. There have almost certainly been more curves that I am unaware of.[/QUOTE]
[QUOTE=pinhodecarlos;288477]Shall we start an ecm effort on this number (6115909044841454629^17-1)?[/QUOTE]

[QUOTE=wblipp;288505]I don't think so.

Factors would certainly be welcome - it is the number one composite on Pascal's [URL="http://www.lirmm.fr/~ochem/opn/mostwantedrb.txt"]MostWanted[/URL] list. But it is unlikely to yield to ECM, it's too large for casual NFS and it's too specialized for leading edge NFS. Hence ECM effort is unlikely to find a factor and unlikely to move the number into NFS at this time. If anybody is so reckless as to do ECM anyway, please keep me informed so I can track the work done.

Any further discussion should go to the gratuitous OPN factors thread.

William[/QUOTE]I've run some ECM, but it's probably not worth tracking, since it was at a lower level than yours. And I couldn't get GMP-ECM to run curves beyond 110M on it for some reason; I was working on an NFS job, so I didn't take the time to troubleshoot it.....maybe I will now.

ECM to 2/9 of SNFS difficulty
SNFS sieving by RSALS
Post Processing by Carlos Pinho

[code]
1013^79-1
prp71 factor: 61908407305783502184361577849145591617744845905062019885322917476819869
prp130 factor: 1031755536764245420291818293331772495431814120620433033578607359686936941933232433899690531389866231063049116426038021912082831581
[/code]

2833^53-1:[code]Mon Feb 13 10:59:49 2012 prp70 factor: 5858021734844537283255756656531652350809119929914445049947932118554247
Mon Feb 13 10:59:49 2012 prp110 factor: 56133771423980591936883196852401771213331299574843612300433775637083241028968167436505267337247880102467796803[/code]

ECM to 2/9 of SNFS difficulty
SNFS sieving by RSALS
Post Processing by Carlos Pinho

[code]
419^89-1
prp73 factor: 1195989149674371639362830439103959473297743281409017757194313778458822413
prp134 factor: 30501329170198307688157924327176164394984233870494686975482354900896517885075541206269516885067403291134118415035663770988821108037383
[/code]

From 2897^53-1:[code]prp77 factor: 55678154452185411487514575600667652084305679371749193537248552169364401803133
prp104 factor: 18870649876650288888565388030047001873300658312572446404239873995240636459867659976055504693602928460857[/code]

From 2909^53-1:[code]prp84 factor: 104830967280915703988293399341522409657291292974478181992423283041296538022294732713
prp98 factor: 12426053835070773344116132831892151813831111479410488512139246675462056429222387420000140309873157[/code]

ECM by Rich Dickerson and yoyo@home
Sieving by RSALS
Post Processing by Zetaflux

All are Brent composites. The last two had no known factors
[code]
449^89-1:
P82: 2008493404107569394420062302393648556237586118301092188166693234293276609847913393
P130: 1559931471289558613430628659954068393833677096313321103972935811171621894124704948761611180497642922709021530945751076432816703583

509^83-1:
P83: 17837104654415588223291790530670717087568754776061537400772951067319592989416081613
P96: 930603225396685006993910773326623796477963842419029110155846667886878734263600498720958235736913

1187^73-1:
P84: 273294598072570405477108134563010903290970447593490816143157463152429945435329066801
P138: 839821032890637835179494063673294138057039791146192021456010466665208874027441796812843052531596232512721295257829136930988104815226346561

1367^71-1:
P105: 644495316279973536317635874180250038401754308187775334717273582053643905887228044221110230099551948419053
P115: 4953293581984404819604011677136175053592421399479831074965550376217182669692983136935081794604972300500085733843709[/code]

Is [url]http://www.lri.fr/~ochem/opn/[/url] down or has it been moved? I was wanting to check progress on it.

Chris K

Moved to [url]http://www.lirmm.fr/~ochem/opn/[/url]

Thanks.

NB. [url]http://www.oddperfect.org/[/url] still points to the old address.

Chris K