mersenneforum.org Other Factordb Problems
 Register FAQ Search Today's Posts Mark Forums Read

 2021-03-14, 17:01 #463 chris2be8     Sep 2009 23·3·5·17 Posts I've not had any problems. And I'm running a script to add algebraic factors to numbers in factordb so I've been doing about 1 access per second so would notice any outage. Chris
 2021-04-14, 06:34 #464 bur   Aug 2020 A316 Posts I saw this already mentioned in another thread, numbers of the form k*2^n+1 are called Cullen numbers in the "More information - Listed as or is factor of listed special form" tab on factordb. Example: 2^700*3+1 (click on more information) The respective -1 form has --- none --- in that field. I tried for a while to transform 3*2^700+1 to Cullen form, but got stuck at 48 * 256^87 + 1 ;)
2021-04-14, 07:36   #465
Happy5214

"Alexander"
Nov 2008
The Alamo City

59710 Posts

Quote:
 Originally Posted by bur I saw this already mentioned in another thread, numbers of the form k*2^n+1 are called Cullen numbers in the "More information - Listed as or is factor of listed special form" tab on factordb. Example: 2^700*3+1 (click on more information) The respective -1 form has --- none --- in that field. I tried for a while to transform 3*2^700+1 to Cullen form, but got stuck at 48 * 256^87 + 1 ;)
That is definitely not a Cullen number. Please rename that category to "Proth numbers" or restrict it to numbers where k==n, the actual definition of Cullen numbers, in order to match the Woodall category.

 Similar Threads Thread Thread Starter Forum Replies Last Post enzocreti FactorDB 10 2021-01-05 19:49 carpetpool FactorDB 6 2017-01-23 11:04 smh FactorDB 231 2015-07-28 02:30 firejuggler Aliquot Sequences 2 2010-06-15 14:03 Raman Factoring 15 2010-01-28 10:24

All times are UTC. The time now is 23:01.

Fri May 7 23:01:12 UTC 2021 up 29 days, 17:42, 0 users, load averages: 1.71, 2.06, 2.35

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.