Sierp odd-n prime and status
 

[SIZE=2]Sierp base 2 odd-n:[/SIZE]
[SIZE=2]70467*2^268503+1 is prime[/SIZE]

[SIZE=2]Sierp base 2 odd-n k=37953, 53133, 60357, 80463, 84363, & 85287 all now at n=286K.[/SIZE]


[SIZE=2]Gary[/SIZE]

[SIZE=2]Sierp base 2 odd-n:[/SIZE]
[SIZE=2]37953*2^298913+1 is prime[/SIZE]

Now down to 7 k's remaining.

[SIZE=2]Sierp base 2 odd-n k=53133, 60357, 80463, 84363, & 85287 are all now at n=305K; still going to n=600K.[/SIZE]

Note: I have been double-checking k=9267 and 32247 along with this so I still have 7 k's in my sieved file. I'll double-check them to n=600K along with the rest. If I decide to continue higher than n=600K with the other k's, I'll drop the double-checking of the 2 k's at that point.


[SIZE=2]Gary[/SIZE]

Riesel base 4 and 16 status on 2 reserved k's
 

Riesel base 4 k=13854 and 19464 are complete to n=300K. No primes. They are now unreserved.

This means that the same k's on Riesel base 16 are completed to n=150K and are also unreserved.

Riesel base 2 odd-n status
 

Riesel base 2 odd-n k=6927 is now complete to n=600K and unreserved. No primes.

It had been tested in conjunction with base 4 k=13854.

even Riesel:
k=14361, 19401 and 20049 at n=300k (even)

Another Riesel base 2 - odd n prime.
 

On 01/02/2008, I found :

288234*2^224976-1 is prime! Time : 290.692 sec.

which is 144117*2^224977-1

Now, only 16 k's are remaining

All these remaining k's have been tested at least up to n = 256K (262144).

Jean

New status for Riesel base 2 odd n
 

From "regular" primes thread :

288234*2^224976-1 is prime! Time : 290.692 sec.

which is 144117*2^224977-1

Now, only 16 k's are remaining

Also, I reached the 256K limit for :

k = 133977, n = 262029, no prime
k = 145257, n = 261781, no prime
k = 147687, n = 261881, no prime
k = 148323, n = 262079, no prime
k = 154317, n = 262065, no prime
k = 155877, n = 262085, no prime

So, I am unreserving these k's for now (but perhaps would reserve some of them later...).

Regards,
Jean

[quote=Jean Penné;126068]On 01/02/2008, I found :

288234*2^224976-1 is prime! Time : 290.692 sec.

which is 144117*2^224977-1

Now, only 16 k's are remaining

All these remaining k's have been tested at least up to n = 256K (262144).

Jean[/quote]

Jean,

Welcome back from vacation! It's always nice to come back to a prime. :smile:

Per a previous posting, I show k=39687 only tested to n=253.1K. Is that correct?


Thanks,
Gary

Yes, I forgot it!
 

[QUOTE=gd_barnes;126082]Jean,

Welcome back from vacation! It's always nice to come back to a prime. :smile:

Per a previous posting, I show k=39687 only tested to n=253.1K. Is that correct?


Thanks,
Gary[/QUOTE]

You are perfectly right, Gary, I forgot to complete this one!!
I am restarting it now from this point...

Thanks,
Jean

k = 39687 now tested up to 256K (Riesel odd n's)
 

[QUOTE=Jean Penné;126087]You are perfectly right, Gary, I forgot to complete this one!!
I am restarting it now from this point...

Thanks,
Jean[/QUOTE]

Completed :
k = 39687, n = 261837, no prime...

so, I am also unreserving this k for now.
I shall now try to make some further sieving on the 16 remaining k's...
Regards,
Jean

New status for Sierpinski base 2 - even n's
 

Here is to-day's status for Sierpinski base 2 - even n's (which is half of remaining k's for Sierpinski base 4) :

k = 23451 is up to n = 1,977,272 no prime...

k = 60849 is up to n = 1,940,034 no prime...

Regards,
Jean