reserving the following 7 Riesel Base 256 k's:
1695 2237 2715 2759 3039 3147 3155 I am not sure how far I will take them, but no more than 50k might be less, I am going to orientation for a new job soon out of town, so I don't want to commit to anything big. 
3155*256^270101 is prime
3155*2^2160801 is prime! Let me know if I need to do anything else with this. 
[quote=grobie;131887]3155*256^270101 is prime
3155*2^2160801 is prime! Let me know if I need to do anything else with this.[/quote] Nope, nothing more to do. Karsten should automatically list it on his 2000 < k < 4000 page when he gets it updated. Nice work! It's good to knock out some of the base 256 k's. There's a very large # of k's remaining for such a high base. Gary 
[QUOTE=grobie;131887]3155*256^270101 is prime
3155*2^2160801 is prime! Let me know if I need to do anything else with this.[/QUOTE] Here is another one for Riesel Base 256: 3039*2^2810561 is prime!:smile: 
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[QUOTE=grobie;131843]reserving the following 7 Riesel Base 256 k's:
1695 2237 2715 2759 3039 3147 3155 [/QUOTE] All k's completed to 50k 2 primes already reported, no additional primes. 
I'm reserving all remaining unreserved Riesel base 256 kvalues (41 total k's). I'll take them from n=25K75K (n=200K600K base 2). This will be a doublecheck for the lower ranges on some of them.
Sieving has complete to P=1T, which is sufficient up to n=50K. Starting at only n=25K, I will initially will have only one highspeed core on it but will work up to having a full quad on it. My goal is to have all powersof2 bases kvalues up to n=600K base 2 by the end of Sept. Riesel and Sierp base 16 are close (n=560K base 2) and there are several evenn and oddn conjectures kvalues that are near n=400K that need to be pushed a little to accomplish this. Edit: Although I am doublechecking several k's that are already searched past n=75K, I won't show them as reserved since technically I'm not searching any new range on them. Anyone is free to reserve any kvalue and test it above n=75K. Gary 
5139*256^307401 is prime

2 primes from Riesel base 256:
5027*256^288731 is prime 4137*256^292731 is prime 44 k's to go and testing is complete to n=32.8K on two cores. Gary 
Riesel base 256 at n=33.5K; one prime reported for n=30K35K; continuing.

3855*256^366661 is prime
Riesel base 256 currently at n=37K with 43 k's remaining. 
5247*256^369911 is prime
42 k's now remaining. 
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