[QUOTE=gd_barnes;193150]I see that the downdriver was hit at 131 digits. Does anyone know what the record high size for hitting a downdriver is?[/QUOTE]

According to [URL="http://www.lafn.org/~ax810/aliquot.htm"]Clifford Stern's page[/URL], the current record is at 141 digits for sequence [URL="http://factordb.com/search.php?se=1&aq=199152&action=last20&fr=&to="]199152[/URL].

I advanced 919530 a little bit but am not reserving it. Status:

919530; i=4023; sz 112; C106; +77; 2^5*7

2^5*7 has turned out to be very stubborn to get rid of.

I am now done with 104400. Status:

104400; i=1807; sz 110; C105; +47; 2^2*3*7

I am now done with 305454. Status:

305454; i=4628; sz 115; C107; +58; 2^4*3*31

This is the one that Bosma had supposedly already searched to i=4589 but it was only at i=3461 in the DB when I reserved it. Not long before I started to search it, a mystery worker came in and loaded up to i=4570. In doing so, he left an uncorrectable error in the DB. I subsequently contacted Syd, who corrected it. Hence I only ended up searching 58 indexes. The good news is that I was easily able extend it 39 indexes beyond where Bosma had it.

Thanks mystery worker for saving me searching over 1100 indexes! :smile: It is one of several that were previously at C<100 and i>4000. I plan to play "catch up" up on many of the rest to C>=100 with my next few reservations.


Gary

I am now done with 473502. Status:

473502; i=3546; sz 110; C105; +136; 2^5*3*7

Well...I accomplished a first for me on this one: I was able to drop a 2^6*127 driver!! :smile: Just 6 indexes from the end, it changed over to 2^5*3*7 after going through 2^6*3^4*127 and 2^6*3*127^2.

The only problem is that I've also found 2^5*7 to be quite difficult to get rid of as I additionally found with recently released 919530.

[QUOTE=gd_barnes;193404]I am now done with 473502. Status:

473502; i=3546; sz 110; C105; +136; 2^5*3*7

Well...I accomplished a first for me on this one: I was able to drop a 2^6*127 driver!! :smile: Just 6 indexes from the end, it changed over to 2^5*3*7 after going through 2^6*3^4*127 and 2^6*3*127^2.

The only problem is that I've also found 2^5*7 to be quite difficult to get rid of as I additionally found with recently released 919530.[/QUOTE]

You did it once before without knowing - I think I am the only one who knows that. (And you broke the record.)

But this time I think you broke your record again. :party:

BTW: the driver is 2^5 * 3 * 7, not 2^5 * 7. Without the 3, it is as easy to escape from as 2^2.

[quote=10metreh;193415]You did it once before without knowing - I think I am the only one who knows that. (And you broke the record.)

But this time I think you broke your record again. :party:

BTW: the driver is 2^5 * 3 * 7, not 2^5 * 7. Without the 3, it is as easy to escape from as 2^2.[/quote]

Really?? I set some sort of record?! :surprised Can I assume that this record is the one for the highest-digit escape from 2^6*127?

If so, cool! :cool: :toot:

There has to be some sort of payback for taking sequences that have little chance of termination in the name of "filling in the size holes" for low or long sequences. :rolleyes:


Gary

Christophe Clavier reports that 1560 has acquired the downdriver at 142 digits. :party:

I am now done with 111912. Status:

111912; i=675; sz 117; C100; +89; 2^6*3*127

I'm extending at least 2 of the shortest sequences in the "leader board for 100k range" thread that are listed in the [URL="http://www.mersenneforum.org/showpost.php?p=171629&postcount=3"]3rd post[/URL] in an attempt to either bring them to i>300 or to simply get them out of their "shortest sequences" definition. Many have already gotten that far. A few haven't.

I've extended 131292 a little bit and am done with it. Status:

131292; i=312; sz 105; C102; +7; 2^5

This is an interesting one now. Someone with a few more resources may want to take a crack at it. I only extended it 7 indexes but in the process dropped the extremely long-standing factor of 3. I also had an index where it went down for the first time since i=12. Since it is driverless and no longer has a factor of 3 now, perhaps it is about to crack.

232800 at 133 digits, index 933, acquired the 2^3*3*5 driver. I ran it an few indexes farther, but it looks like it has a c119 next, so I plan to retire it. There are enough sequences without drivers to do first.

500640 on the other hand hit the down driver at 124 digits.