Contribution and Reservation

6·10²¹⁵+1 =: 6(0)₂₁₄1_<216>; = 27743 · 2608618741_<10> · 2762769781_<10> · [3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367_<193>] SUBMIT/RESERVE

Status

Expression:	6·10²¹⁵+1
Composite Factor:	300083779745525475930289588890717897020479114910546270781725 667249483283431304856951689639299897046720535043479447035188 625169769425940886524424815687565232106775933429194043567300 9544143681367 (193-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 216.48-digit and the GNFS difficulty is 192.48-digit. SNFS must be faster than GNFS. It will take about 69 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 60001_215.
Put the following polynomial file 60001_215.poly in there too.
And then, run "perl factMsieve.pl 60001_215".

60001_215.poly ^*1

n: 3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367
m: 1000000000000000000000000000000000000
deg: 6
c6: 3
c0: 5
skew: 1.09
type: snfs
lss: 1
rlim: 28000000
alim: 28000000
lpbr: 29
lpba: 29
mfbr: 58
mfba: 58
rlambda: 2.6
alambda: 2.6

*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 193-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	Apr 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 3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367 | ecm -n -c 825 1e6

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

echo 3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367 | ecm -n -c 2336 3e6

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

echo 3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367 | ecm -n -c 4479 11e6

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

echo 3000837797455254759302895888907178970204791149105462707817256672494832834313048569516896392998970467205350434794470351886251697694259408865244248156875652321067759334291940435673009544143681367 | ecm -n -c 7553 43e6

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