Forum: Factoring
2020-12-14, 20:28
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Replies: 9
Views: 675
Since no one else has replied. Way back in the...
Since no one else has replied. Way back in the 1990s, I maintained a collection of abstracts in the field of cryptography -- if you try really hard you might still be able to find traces of it. ...
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Forum: Factoring
2020-11-03, 20:06
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Replies: 507
Views: 71,192
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Forum: Factoring
2020-06-29, 03:18
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Replies: 148
Views: 27,936
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Forum: Factoring
2020-03-21, 04:08
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Replies: 507
Views: 71,192
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Forum: Factoring
2020-02-19, 20:17
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Replies: 419
Views: 48,740
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Forum: Factoring
2019-09-30, 19:57
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Replies: 148
Views: 27,936
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Forum: Factoring
2019-09-23, 21:45
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Replies: 148
Views: 27,936
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Forum: Factoring
2019-09-23, 21:18
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Replies: 148
Views: 27,936
The most interesting cases in the OEIS wanted...
The most interesting cases in the OEIS wanted numbers list are those marked "*". They correspond to sequences where only a few terms are known (e.g. not enough to fill the usual data lines in the...
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Forum: Factoring
2018-09-19, 21:19
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Replies: 41
Views: 4,111
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Forum: Factoring
2018-07-01, 19:22
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Replies: 507
Views: 71,192
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Forum: Factoring
2018-05-16, 21:34
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Replies: 3
Views: 1,021
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Forum: FactorDB
2018-05-04, 20:52
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Replies: 458
Views: 53,919
I think there are others higher up as well. My...
I think there are others higher up as well. My efforts to sweep downwards from 120 digit numbers also periodically hit them. Unfortunately, I haven't been able to isolate any of the higher ones to...
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Forum: FactorDB
2018-03-01, 21:53
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Replies: 458
Views: 53,919
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Forum: FactorDB
2018-03-01, 21:51
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Replies: 2
Views: 2,740
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Forum: Factoring
2017-12-18, 20:19
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Replies: 507
Views: 71,192
Yes, it is the same me. There is no longer a...
Yes, it is the same me. There is no longer a website devoted to the factorial numbers -- in fact the ECMNET page still attempts to link to your old non-existent page. I have files with all the...
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Forum: Factoring
2017-12-06, 09:26
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Replies: 507
Views: 71,192
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Forum: FactorDB
2017-11-12, 22:05
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Replies: 458
Views: 53,919
I've looked at a few of the what looks like...
I've looked at a few of the what looks like useless C100s that someone added (i.e. those with id's starting around 1100000000968200000). I factored a few with near id's in the hope of observing a...
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Forum: YAFU
2017-10-14, 02:30
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Replies: 7
Views: 1,920
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Forum: YAFU
2017-10-13, 18:21
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Replies: 7
Views: 1,920
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Forum: YAFU
2017-10-13, 09:08
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Replies: 7
Views: 1,920
Resume dependency processing?
I'm trying to factor the C195 cofactor of Pell(583) by SNFS using Yafu. All the sieving completed, linear algebra completed, and it produced a 51-digit prime factor from dependency 2, but left a...
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Forum: Factoring
2017-09-26, 21:46
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Replies: 507
Views: 71,192
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Forum: Factoring
2017-09-26, 18:41
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Replies: 507
Views: 71,192
Nice. There are currently now only 3 factorial...
Nice. There are currently now only 3 factorial numbers with cofactors less than C200: 167!-1 C181, 145!-1 C185, and 169!+1 C193. Of these, I've done the most ecm on 145!-1 (t55 done, plus some of...
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Forum: Factoring
2017-09-14, 04:52
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Replies: 2
Views: 1,162
Iteration of (sigma(n)+phi(n))/2
In recent weeks there has been some interest on the seqfan mailing list about iterating the map (sigma(n)+phi(n))/2 (see for example A291790 (https://oeis.org/A291790)).
In many cases the map...
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Forum: FactorDB
2017-09-11, 18:57
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Replies: 458
Views: 53,919
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Forum: YAFU
2017-05-18, 04:14
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Replies: 22
Views: 3,141
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