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 2021-03-14, 17:01 #463 chris2be8     Sep 2009 111111110002 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 163 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

601 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.

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