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 2021-03-14, 17:01 #463 chris2be8     Sep 2009 7FA16 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 A916 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

60510 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.

 2021-05-14, 15:57 #466 bur   Aug 2020 101010012 Posts Yep, Proth is altogether missing from factordb, these numbers are consistently called Cullen at the site. It would probably be sufficient to exchange one string for the other.

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