Database for k-b-b's: - Page 13

Oddball · 2010-09-15, 05:01

Quote:

Originally Posted by gd_barnes

NewPGen is pointless except for exotic fixed-n searches on twins

IMO, a fixed n search for twins isn't exotic.

mdettweiler · 2010-09-15, 05:05

Quote:

Originally Posted by Oddball

IMO, a fixed n search for twins isn't exotic.

Well, compared to your run-of-the-mill non-twin search, any twin search is somewhat "exotic". I suppose it's a matter of degree. (A triplet or quad search, for instance, would be respectively more exotic...

)

kar_bon · 2010-09-15, 08:16

I've included a new page with primes of the form k*b^b+1 at Riesel DataBase (menu 'Interests').

A page for k*b^b-1 will follow.

PS: I included a table with the first k-value > 10000 where the base b had none for k<=10000.

3.14159 · 2010-09-15, 22:43

Quote:

Originally Posted by Gary

People will just laugh at you if you continue to use it for efforts like this.

Big deal. Allow them to laugh. It has no influence on me.

Quote:

Originally Posted by Karsten

I've included a new page with primes of the form k*b^b+1 at Riesel DataBase (menu 'Interests').

Excellent update; Any exact completion date for the -1 analogues of the k-b-b's?

3.14159 · 2010-09-15, 22:46

I'll work on b = 1001 to 1250.

Trial-dividing to 1048576.

Whenever I happen to finish; Check the work for verification.

3.14159 · 2010-09-15, 22:53

Quote:

Originally Posted by Gary

Gad, 130 posts to run a simple script. Unbelievable. A moderator should delete about 90% of the posts in this thread.

Since you're a moderator; Why not walk the walk and delete the 90% of the posts you wanted deleted?

axn · 2010-09-15, 23:07

Quote:

Originally Posted by 3.14159

Since you're a moderator; Why not walk the walk and delete the 90% of the posts you wanted deleted?

He's not a moderator of this forum (Misc Math). OT is. So, only OT or supermods can do anything here.

3.14159 · 2010-09-15, 23:11

Well, I'm up to b = 1005.

This can be done within a few days.

kar_bon · 2010-09-16, 21:52

A question comig up:

Exist a value b for which k*b^[i]b[/i]+1 is never prime for k>=1?

3.14159 · 2010-09-16, 21:54

Quote:

Originally Posted by Karsten

Exist a value b for which k*b^b+1 is never prime for k>=1?

Hopefully you intended to be humorous here.

kar_bon · 2010-09-16, 21:57

Quote:

Originally Posted by 3.14159

Hopefully you intended to be humorous here.

Why? It's a question accordingly to the results here and I don't know if anybody has solved/proved this before.

2010-09-15, 08:16	#135
kar_bon Mar 2006 Germany 2²×727 Posts	I've included a new page with primes of the form kb^b+1 at Riesel DataBase (menu 'Interests'). A page for kb^b-1 will follow. PS: I included a table with the first k-value > 10000 where the base b had none for k<=10000. Last fiddled with by kar_bon on 2010-09-15 at 09:00

2010-09-15, 22:46	#137
3.14159 May 2010 Prime hunting commission. 2⁴·3·5·7 Posts	I'll work on b = 1001 to 1250. Trial-dividing to 1048576. Whenever I happen to finish; Check the work for verification. Last fiddled with by 3.14159 on 2010-09-15 at 22:53

2010-09-15, 23:11	#140
3.14159 May 2010 Prime hunting commission. 2⁴×3×5×7 Posts	Well, I'm up to b = 1005. This can be done within a few days. Last fiddled with by 3.14159 on 2010-09-15 at 23:12

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2010-09-16, 21:52	#141
kar_bon Mar 2006 Germany 2²×727 Posts	A question comig up: Exist a value b for which k*b^[i]b[/i]+1 is never prime for k>=1?