Forum: Math
2020-06-24, 20:39
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Replies: 247
Views: 56,458
Avoiding multiples or 2 or 3 in hash values
If you just want to eliminate values that are multiples of 2 or 3:
int add[2*3] = { 1, 0, 3, 2, 1, 0 };
value += add[value % 6];
The value will always be either 1 or 5 mod 6 after this but...
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Forum: Math
2020-06-23, 19:08
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Replies: 247
Views: 56,458
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Forum: Data
2019-10-18, 17:06
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Replies: 566
Views: 99,217
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Forum: Data
2019-09-23, 20:04
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Replies: 566
Views: 99,217
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Forum: Data
2019-09-20, 09:12
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Replies: 566
Views: 99,217
I've now written a Perl script to convert the...
I've now written a Perl script to convert the text format download of this page
into the mers format I've been using for 30 years and these are the only
listed factors I didn't already have as of a...
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Forum: Data
2019-09-20, 09:08
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Replies: 566
Views: 99,217
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Forum: Information & Answers
2019-09-20, 06:33
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Replies: 67
Views: 17,041
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Forum: Data
2019-09-20, 06:08
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Replies: 566
Views: 99,217
Thank you, ATH; I'll add those to my data.
...
Thank you, ATH; I'll add those to my data.
I was downloading from mersenne.ca automatically at one point, but it was too
much traffic for the web server; I may have time soon to try again.
...
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Forum: Data
2019-09-20, 03:47
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Replies: 566
Views: 99,217
I verified this certificate - for M3413 - just...
I verified this certificate - for M3413 - just now.
In my data as of the 15th, there are 261 prime exponent Mersenne numbers that are
fully factored, all factors and cofactors proven prime, and...
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Forum: Data
2018-07-16, 05:44
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Replies: 566
Views: 99,217
My data has 286 prime exponent Mersenne numbers...
My data has 286 prime exponent Mersenne numbers with prime or SPRP cofactors, which is a bit less, but I have a somewhat different definition of factors for Mersenne numbers than factordb.com uses.
...
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Forum: Information & Answers
2018-07-13, 20:43
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Replies: 67
Views: 17,041
Primality certificates
I have now uploaded all of my primality certificates to factordb.com; there were a couple dozen I had that it didn't.
I'm now starting to find the certificates it has that I don't and verify...
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Forum: Information & Answers
2018-07-12, 17:50
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Replies: 67
Views: 17,041
factordb vs my data
It looks like I have several primo primality certificates that factordb doesn't.
I've already uploaded a few by hand but it's hard to tell which ones I have that it doesn't, so I will likely end up...
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Forum: Information & Answers
2018-07-11, 15:30
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Replies: 67
Views: 17,041
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Forum: Information & Answers
2018-07-09, 04:31
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Replies: 67
Views: 17,041
Thanks, I had noticed factordb.com while trying...
Thanks, I had noticed factordb.com while trying to catch up here on the forums and have been pulling data from GIMPS automatically for years and been running on my own PCs when I have such that don't...
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Forum: Information & Answers
2018-07-07, 15:24
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Replies: 67
Views: 17,041
Prime or SPRP cofactors of Mersenne numbers
In case anyone is still interested, I have started to get back into this stuff after moving in January and just uploaded current data to a new 'mers' project on sourceforge.
In particular, see:
...
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Forum: PrimeNet
2018-07-05, 19:44
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Replies: 4
Views: 1,975
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Forum: GPU Computing
2017-05-28, 21:16
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Replies: 1,676
Views: 231,030
Changes ?
I see that https://github.com/Bdot42/mfakto has not changed in a year but I had to make some small changes to compile cleanly on Cygwin and on Ubuntu 16.
Should I request a push there ? Or create...
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Forum: Data
2010-11-29, 06:19
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Replies: 9
Views: 2,503
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Forum: Data
2010-11-27, 23:59
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Replies: 9
Views: 2,503
The data I have includes lots of information...
The data I have includes lots of information about these larger exponents ... and about exponents considerably higher. There was some effort a while back to try to find factors of "repeated"...
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Forum: Information & Answers
2010-11-27, 23:31
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Replies: 67
Views: 17,041
A lot of the data I have - nearly everything I...
A lot of the data I have - nearly everything I have for prime exponents, e.g. - is on my web site. The smallest SPRP cofactors should be these. The first number after each 'd' (for "done", SPRP;...
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Forum: Information & Answers
2010-11-27, 23:19
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Replies: 67
Views: 17,041
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Forum: Data
2010-11-27, 23:11
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Replies: 9
Views: 2,503
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Forum: Data
2010-11-26, 19:33
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Replies: 9
Views: 2,503
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Forum: Information & Answers
2010-11-26, 04:40
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Replies: 67
Views: 17,041
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