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Forum: Riesel Prime Search

2005-02-04, 01:32

Replies: 599

Riesel Primes k*2^n-1, k<300 [Was "k=1"]

Views: 35,377

Posted By JCS

Speaking of 91...

Number 91 on the top 5000 is now 9*2^828709-1, which was proven prime earlier today! :banana:

The k=9 search had been primeless for 6 months.

Other recent finds:
129*2^292573-1
...

Forum: Riesel Prime Search

2005-01-16, 07:23

Replies: 599

Riesel Primes k*2^n-1, k<300 [Was "k=1"]

Views: 35,377

Posted By JCS

A status update: k=9, at 801k. No new primes...

A status update:

k=9, at 801k. No new primes since 503k.
k=33, complete to 500k.
k=105, complete to 500k (prime for n=484658 and n=472430)
k=117, at 438k. No new primes.
k=129, at 253k,...

Forum: 15k Search

2005-01-15, 21:17

Replies: 415

Sticky: POST PRIMES you've found here, and name or prover code

Views: 51,111

Posted By JCS

I ran 3825 up to n=250k and found four primes: ...

I ran 3825 up to n=250k and found four primes:

3825 198142
3825 204711
3825 205759
3825 229879

Forum: Riesel Prime Search

2004-12-28, 00:24

Replies: 599

Riesel Primes k*2^n-1, k<300 [Was "k=1"]

Views: 35,377

Posted By JCS

Hi Cyrix, I am nearly done checking 105 up...

Hi Cyrix,

I am nearly done checking 105 up to 500,000. With only 1600 n's remaining, there have been no new primes since n=280022. Fairness would dictate that I'm long overdue for another prime,...

Forum: Riesel Prime Search

2004-11-28, 14:12

Replies: 599

Riesel Primes k*2^n-1, k<300 [Was "k=1"]

Views: 35,377

Posted By JCS

Thanks! Ok, here goes. My upper limit is n=500k,...

Thanks! Ok, here goes. My upper limit is n=500k, except for k=9.

k=9: at 744k
k=33: at 410k
k=43: complete to 500k
k=51: at 475k (51*2^468417-1 is prime!)
k=59: at 360k (59*2^358276-1 is...

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