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Old 2021-08-09, 13:47   #1
unconnected's Avatar
May 2009
Russia, Moscow

51728 Posts
Default Factoring near-repdigit numbers

Hi guys, did you aware of this nice site maintaining factorizations of near-repdigit-related numbers? BTW, I've collected all composites from it to check them against factorDB which revealed 16 new factorizations (reported with as a source). Here are the full list as of 08/08/2021, total 20032 composites, feel free to factor them.
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File Type: 7z nrr_composites_all.7z (1.86 MB, 58 views)
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Old 2021-08-09, 15:12   #2
RichD's Avatar
Sep 2008

1101100000102 Posts

yoyo occasionally works on them. You can check its status here.
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Old 2021-08-10, 06:30   #3
bur's Avatar
Aug 2020

2×211 Posts

Yes, I browse it from time to time. Keeping track of ECM effort is really good and also showing the required SNFS parameters to proceed, if applicable.

I'd like to see a similar system at of tracking ECM work at factordb, it'd be quite helpful for sequences that are worked on by different people over time.
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Old 2021-08-10, 08:33   #4
sweety439's Avatar
"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36

5·7·89 Posts

Is there any interest to search the generalized near-repdigit primes to other bases? Especially the smallest generalized near-repdigit prime in base b of a given form xyyy...yyy or xxx...xxxy (where x,y are base b digits)?
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Old 2021-11-22, 22:36   #5
unconnected's Avatar
May 2009
Russia, Moscow

2×32×149 Posts

Near-repdigit tables were recently extended and there are many easy composites (started from snfs-140) -
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