Factor of M22133 in factordb but not in PrimeNet

bur · 2023-01-30, 14:57

I found a 37 digit factor of M22133 via B1=3e6 ECM, which was interesting, since two 38 digit factors were already known and found via B1=1e6 ECM.

When I went ahead to enter the factor into factordb, I saw that it was already in there: factordb.com - created July 2021.

Are people doing this kind of work completely outside of GIMPS - i.e. not even submitted their results here? Then again, it was the only such factor that I encountered in that exponent range. So it seems like a unique occurrence which makes it even more strange.

James Heinrich · 2023-02-02, 21:00

I thought maybe I could look through the recent factordb dump to look for Mersenne factors, but unfortunately it's purely a dump of ID,prime with no association to what that might be a factor of.

kruoli · 2023-02-02, 22:01

For that, I wrote a program that does a quick check whether any of the number divided a given composite. It can surely be modified to go over the mersenne.org range. I will have a look at that tomorrow.

2023-01-30, 14:57	#1
bur Aug 2020 796581e-4;32539e-3 2D0₁₆ Posts	Factor of M22133 in factordb but not in PrimeNet I found a 37 digit factor of M22133 via B1=3e6 ECM, which was interesting, since two 38 digit factors were already known and found via B1=1e6 ECM. When I went ahead to enter the factor into factordb, I saw that it was already in there: factordb.com - created July 2021. Are people doing this kind of work completely outside of GIMPS - i.e. not even submitted their results here? Then again, it was the only such factor that I encountered in that exponent range. So it seems like a unique occurrence which makes it even more strange. Last fiddled with by bur on 2023-01-30 at 14:58

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2023-02-02, 21:00	#2
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 2·2,083 Posts	I thought maybe I could look through the recent factordb dump to look for Mersenne factors, but unfortunately it's purely a dump of ID,prime with no association to what that might be a factor of.

2023-02-02, 22:01	#3
kruoli "Oliver" Sep 2017 Porta Westfalica, DE 5×17² Posts	For that, I wrote a program that does a quick check whether any of the number divided a given composite. It can surely be modified to go over the mersenne.org range. I will have a look at that tomorrow.