Numbers of the form 10ⁿ−1

Note

Speaking about numbers of the form 10ⁿ−1 is a little bit sloppy. Exactly spoken the cyclotomic numbers Φ(n,10) are meant.

Efforts (ecm)

n runs@B1 factors details
2439 1@1e3 upto 1@100e3
1000@25e4
1000@1e6
no factor found logfile
6419 1@1e3 upto 1@100e3
1000@25e4
200@1e6
no factor found logfile
22735 1@1e3 upto 1@100e3 p9 = 944366431 (already known)
p13 = 6522660223441 (already known)
p16 = 7121578543593791 (as divisor not known so far)
logfile
22737 1@1e3 upto 1@100e3 p16 = 1406396066088157 (as divisor not known so far) logfile

Results

n digits date factor(s) method
17499 11017 Aug 31, 2018 2618174436157591
listet at factordb as an "orphane" factor
c11001
p−1
22735 18163 Jun 29, 2018 7121578543593791
c18147
ecm
22737 12480 Jun 28, 2018 1406396066088157
c12465
ecm

Related Links

Last update: Aug 31, 2018, 2018