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-   -   646730219521 Divides F19 (https://www.mersenneforum.org/showthread.php?t=13116)

Buckle 2010-02-25 01:08

646730219521 Divides F19
 
This is a smaller factor than I would have anticipated.

646 Billion 730 Million 219 Thousand 521


ECM found a factor in curve #1, stage #1
Sigma=3460786319450698, B1=3000000, B2=300000000.
UID: Buckle/G801, F19 has a factor: 646730219521, AID: A5CC03C1F2227056DE35CDEAC3E17011

David Bessell
(No relation to Uncle Friedrich)

rogue 2010-02-25 01:25

[QUOTE=Buckle;206589]This is a smaller factor than I would have anticipated.

ECM found a factor in curve #1, stage #1
Sigma=3460786319450698, B1=3000000, B2=300000000.
UID: Buckle/G801, F19 has a factor: 646730219521, AID: A5CC03C1F2227056DE35CDEAC3E17011[/QUOTE]

This is a known factor equivalent to 308385*2^21+1.

Buckle 2010-02-25 02:12

Ooops
 
sorry
typo in the "work to do" file

rogue 2010-02-25 04:08

[QUOTE=Buckle;206598]sorry
typo in the "work to do" file[/QUOTE]

Keep at it. You might get lucky...

ET_ 2010-02-25 10:29

[QUOTE=rogue;206591]This is a known factor equivalent to 308385*2^21+1.[/QUOTE]

Maybe a lowp.txt file not updated?

Luigi

bdodson 2010-03-27 01:08

[QUOTE=rogue;206605]Keep at it. You might get lucky...[/QUOTE]

Nice suggestion! The F22 factor is p35? Also GIMPS ecm, as above? -Bruce

(no google hits for the factor, not even the forum post.)

update:
[code]
1 Buckle 15540.872 7626 2 |
2 James Hintz 2529.371 2881 0 |
3 eteo 2259.553 67 0 |
4 Tapio Rajala 2125.422 770 1 | 1 [/code]
is the GIMPS listing for ECM on Fermat numbers. I also got what
appeared to be a law firm listing in .au, for what it's worth.

ixfd64 2010-03-28 02:21

[QUOTE=rogue;206605]Keep at it. You might get lucky...[/QUOTE]

It looks like he did. :smile:

Buckle 2010-03-29 22:56

[quote=bdodson;209661]Nice suggestion! The F22 factor is p35? Also GIMPS ecm, as above? -Bruce

(no google hits for the factor, not even the forum post.)

update:
[code]
1 Buckle 15540.872 7626 2 |
2 James Hintz 2529.371 2881 0 |
3 eteo 2259.553 67 0 |
4 Tapio Rajala 2125.422 770 1 | 1 [/code]
is the GIMPS listing for ECM on Fermat numbers. I also got what
appeared to be a law firm listing in .au, for what it's worth.[/quote]


The law firm is Page Seager and another David Bessell works there. Coincidentally PS is situated about 200 metres down the road from St Michael's Collegiate where I work.


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