Riesel base 398
 

Primes found:

2*398^32-1
3*398^1-1
4*398^3-1
5*398^22-1
6*398^2-1

k=7 remains. This has been tested to n=25000. I am releasing the base.

Reserving Riesel 363 and 376 as new to n=25K

Riesel base 467, k=14

Primes:
2*467^36-1
4*467^1-1
6*467^1-1
8*467^20-1
10*467^15-1
12*467^2-1

Base proven.

Reserving S383 as new. To at least n=25K :smile:

Status update for S58 and S60 will come this friday or saturday, with at least 4 new primes to show for S60.

Regards

KEP

2*461^n+1 n=25K-75.7K is done. No primes. Residues emailed.
(I ran it to test the time, then forgot about it. Now stopped at n=75735.)

S398 k=8 conjecture proven and added to the pages.

This one took a fairly large prime to finish it off:
7*398^17472+1

Reserving Sierp 401 & 469 as new to n=25K

Riesel Base 363
 

Riesel Base 363
Conjectured k = 64
Covering Set = 7, 13
Trivial Factors k == 1 mod 2(2) and k == 1 mod 181(181)

Found Primes: 30k's - File attached

Remaining k's: 1k - Tested to n=25K
34*363^n-1

Base Released

Riesel Base 376
 

Riesel Base 376
Conjectured k = 144
Covering Set = 13, 29
Trivial Factors k == 1 mod 3(3) and k == 1 mod 5(5)

Found Primes: 76k's - File attached

Trivial Factor Eliminations: 66k's

Conjecture Proven

Nice high ck proven with just scripting

Sierp Base 401
 

Sierp Base 401
Conjectured k = 68
Covering Set = 3, 67
Trivial Factors k == 1 mod 2(2) and k == 4 mod 5(5)

Found Primes: 25K's - File attached

Remaining k's: 1k - Tested to n=25k
20*401^n+1

Trivial Factor Eliminations: 7k's

Base Released

Sierp Base 469
 

Sierp Base 469
Conjectured k = 46
Covering Set = 5, 47
Trivial Factors k == 1 mod 2(2) and k == 2 mod 3(3) and k == 12 mod 13(13)

Found Primes: 13k's - File attached

Trivial Factor Eliminations: 9k's

Conjecture Proven