[QUOTE=chris2be8;407611]Is anyone working on 38971^47-1? If not I'll do it.

Chris[/QUOTE]

No response, so I'll queue it for SNFS. It should be done in about a week.

Chris

I have been working sporadically in the Txxxx files.
I hope to get back in to the heavy hitters soon.

I'll reserve a few more fairly small ones for ECM, to be followed by SNFS if necessary:
33247^43-1
33329^43-1
33461^43-1
33589^43-1

@RichD, if you want some heavy hitters the following would be worthwhile:
15083^53-1
15259^53-1
15467^53-1

Please reserve them here before you start work, to prevent wasted effort.

Chris

[QUOTE=chris2be8;407955]@RichD, if you want some heavy hitters the following would be worthwhile:
15083^53-1
15259^53-1
15467^53-1[/QUOTE]

Whoa! These are SNFS-226. That may be over a month for me.

I'll start on the first and do the ECM to t50.

And I'll reserve a few more smallish ones for ECM, to be followed by SNFS if necessary:
3267017731^19-1
33769^43-1
33809^43-1
33961^43-1

Chris

I ran a few extra for 15083^53-1.
7850 @ 43e6.
Releasing number to SNFS, a nice sextic.
-15083+(15083^9)^6

Forgot to mention, starting ECM on the next number.
15259^53-1

15259^53-1
 

Quick solution. :-)
[CODE]********** Factor found in step 2: 33151121440314013162840043172892691367414107687
Found probable prime factor of 47 digits: 33151121440314013162840043172892691367414107687
Probable prime cofactor ((15259^53-1)/(15259-1))/33151121440314013162840043172892691367414107687 has 172 digits[/CODE]

Starting third number for ECM.

15467^53-1
 

Another quick solution.
[CODE]********** Factor found in step 2: 155055119198946098003085581640219675186275020787
Found probable prime factor of 48 digits: 155055119198946098003085581640219675186275020787
Probable prime cofactor ((15467^53-1)/(15467-1))/155055119198946098003085581640219675186275020787 has 171 digits[/CODE]

Thanks!

In the hope that your run of luck continues here are a few more numbers worth ECMing:
16141^53-1
16217^53-1
16231^53-1
18956983^29-1
24671^47-1
24709^47-1
25037^47-1

The last 3 are a bit easier so need less ECM. And would be easier to do by SNFS if you wanted.

Chris

I'll take 24671^47-1 to see how long that takes.
I'm guessing if I go all the way thru SNFS it will be 2-3 weeks.