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 sweety439 2020-10-22 06:36

Why 10^371+-1 are factored earlier than 10^365+-1? eulerphi(371) = 312 > 288 = eulerphi(365)

 VBCurtis 2020-10-22 08:56

[QUOTE=sweety439;560656]Why 10^371+-1 are factored earlier than 10^365+-1? eulerphi(371) = 312 > 288 = eulerphi(365)[/QUOTE]

What relevance does this information have to do with deciding which to factor first?

 charybdis 2021-01-11 19:17

Sam Wagstaff just knocked 2,2390M down to c191 with ECM.
No-one has reserved it yet - could this be a target for a short forum team sieve?

 VBCurtis 2021-01-11 19:33

Sure! I can start poly select this evening. Can you contact Sam to reserve it for MersenneForum?

 charybdis 2021-01-11 19:42

[QUOTE=VBCurtis;569014]Sure! I can start poly select this evening. Can you contact Sam to reserve it for MersenneForum?[/QUOTE]

Done. I suppose it's possible he's already started working on it himself and just hasn't got round to updating the reservation page, so I'll keep everyone updated.

What parameters are you using for polyselect, so I know not to overlap with you?

 VBCurtis 2021-01-11 19:58

I figured I'd start after you, so I'd work around whatever region you select.
I'm fine with using admin of your admax, and incr of 2310 or 4620 to cover a large region up there.

 charybdis 2021-01-11 20:19

Got the go-ahead from Sam. :smile:

 VBCurtis 2021-01-11 23:49

That leaves 10-15M / incr 420 for anyone else to contribute on CADO if they choose.

 firejuggler 2021-01-12 03:14

I've got a 1.377e-14 with Msieve, trying to use cado to spin it up.
Record is around 2e-14 so still a bit far

 charybdis 2021-01-12 17:20

The best from my run, by some margin, is
[code]n: 28653448550423582065969107478752150888235561427247664110066527668159681894430155521476413904809897034030256344677647748498114768327844226758360594247371333432148627535343266861185808662829021
skew: 61160593.83
c0: -782066809369899992846921498396677009099575965
c1: 129978232145697650128010452670728125268
c2: 1136403038232649046041648047998
c3: -50366553898678575377716
c4: 291334628577375
c5: 2637600
Y0: -6410674956398678515938860432260175622
Y1: 195016503229310813759987119[/code]
Cownoise scores this as 2.023e-14. I tried spinning with EdH's script but didn't get an improvement.

 firejuggler 2021-01-12 17:48

That's still close to the record for a C191, so good enough?
afaik

[code]
...

191 2.108e-14 EdH/spin 06-20 kosta M61^16+1
...

[/code]
from the best poly score

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