Contribution and Reservation

(43·10²⁴⁶-7)/9 =: 4(7)₂₄₆_<247>; = 73 · 31687 · 50586569213_<11> · 1246183647631433035043_<22> · [32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753_<209>] SUBMIT/RESERVE

Status

Expression:	(43·10²⁴⁶-7)/9
Composite Factor:	327645862069855653750144921987423576581498953667954642113331 758205278080832278320268479092756746965639550682392551707266 413079488274346304161434721003365075527950652187230763487946 43805343042794904686617295753 (209-digit)
Status:	Not factored. Not reserved. You can submit its factors or reserve it for submitting in the future.

How to factor it

ECM, P-1, P+1

Look for prime factors by GMP-ECM first. Refer to the section "Efforts by ECM". Not only ECM but also P-1/P+1 may be helpful.

SNFS

Use GGNFS and/or Msieve if GMP-ECM cannot find a factor. The SNFS difficulty of this composite number is 247.63-digit and the GNFS difficulty is 208.52-digit. SNFS must be faster than GNFS. It will take about 749 CPU-days to factor this composite number on 64-bit Opteron-2600MHz.

Put factMsieve.pl to which $GGNFS_BIN_PATH and $NUM_CPUS were modified properly in the working directory 47777_246.
Put the following polynomial file 47777_246.poly in there too.
And then, run "perl factMsieve.pl 47777_246".

47777_246.poly ^*1

n: 32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753
m: 100000000000000000000000000000000000000000
deg: 6
c6: 43
c0: -7
skew: 0.74
type: snfs
lss: 1
rlim: 94000000
alim: 94000000
lpbr: 30
lpba: 30
mfbr: 61
mfba: 61
rlambda: 2.7
alambda: 2.7

*1 These parameters were not fully adjusted. The approximate expressions which were used for making the parameters are: deg=expt<=105?4:expt<=210?5:6 or expt<=144?4:6; d=log10(c[deg])+deg*log10(m)[digits]; time=10^(d/30-4)[hours]; skew=|c0/c[deg]|^(1/deg); rlim=round(7*10^(d/60+3)); lpbr=floor(d/25+21); mfbr=floor(d/8+31); rlambda=floor(d/25+18)/10;

Efforts by ECM

The efforts by ECM to find small factors of this 209-digit composite number so far are as follows. According to the reports, unknown prime factors of this composite number are probably 30-digit or more. Please report your efforts by ECM. (Anonymous reports are not acceptable)

Level	B1	Reported runs Total / Required runs (Required runs for lower level)	Name
30	25e4	430	Makoto Kamada	Jan 27, 2009
30	25e4	430 / 430
35	1e6	0 / 825
35	1e6	/ 825
40	3e6	0 / 2336 (294)
40	3e6	/ 2336 (294)
45	11e6	0 / 4479 (677)
45	11e6	/ 4479 (677)
50	43e6	0 / 7553 (1277)
50	43e6	/ 7553 (1277)

Command line to find prime factors up to about 35-digit

echo 32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753 | ecm -n -c 825 1e6

Command line to find prime factors up to about 40-digit

echo 32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753 | ecm -n -c 2336 3e6

Command line to find prime factors up to about 45-digit

echo 32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753 | ecm -n -c 4479 11e6

Command line to find prime factors up to about 50-digit

echo 32764586206985565375014492198742357658149895366795464211333175820527808083227832026847909275674696563955068239255170726641307948827434630416143472100336507552795065218723076348794643805343042794904686617295753 | ecm -n -c 7553 43e6

Submit factors

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