457*2^265533-1 is prime.

-Curtis

Update for k=55951335
 

Testing at n=201259 continuing on

No additional primes to add since last update

1003*2^144163-1 is prime! :smile:

Primes from my mini-drive:
479 300140
449 309416
479 313660
The drive is complete to 330k. This will be posted on Primesearch, if the site still works.
-Curtis

Update for k=55951335
 

Testing completed to n=217438

55951335*2^216360 is Prime

i have taken 8413 to 100k and found 8413*2^19887-1 is prime

[quote=Anonymous;128781]1003*2^144163-1 is prime! :smile:[/quote]
Whoops, now that I looked back and checked things I realized that this prime was already found. :sad: Oh well, not much of a loss since it's relatively puny anyway. :smile:

Update for k=55951335
 

No new primes to report, testing is now at 227k & continuing

Last Prime was: (not on RPS web page)

55951335*2^216360-1

k=684255
 

Tested k=684255 to n=50k with 87 Primes for following n:

[CODE]
1 128 1006 10344
4 129 1082 11474
6 149 1093 11496
8 168 1260 12413
16 189 1305 14898
20 203 1730 15078
23 237 1823 15086
25 298 2113 16353
27 390 2237 16927
32 396 3056 17120
37 398 3497 19208
43 572 3628 20033
45 632 4273 20600
55 684 4841 20712
59 695 5134 21150
60 743 5519 23592
64 808 6320 25294
70 882 6332 27458
83 6778 28981
86 7401 29818
96 8833 36076
98 9608 36949
37816
42464
45760

[/CODE]

k=684255
 

tested to n=60k 2 additional primes:
684255 51110
684255 59320

I am going to let this k go.

Hi grobie, nice primes, I hope you don't mind, but I rearranged your first post to show them in a compact way.