k=1515 tested till n=400000, I'm still working on it

475977645
 

i'm testing 475977645 from the 15k candidates but reported nothing yet.
so far i found 91 primes in the range for n from 1 to 100k:
3,6,7,21,23,28,34,37,46,54,59,67,75,81,96,99,101,107,112,114,123,138,153,
171,215,233,389,421,463,595,652,793,821,952,970,1167,1669,1899,1967,
2025,2217,2254,2260,3059,3118,3787,4828,5352,6049,6544,6675,6676,
6685,6915,7266,7868,8659,9040,9382,9584,9990,10146,10192,10757,11492,
11788,12181,12430,12838,13878,14478,14691,14754,15460,16729,17037,
18310,22465,23662,37615,41087,41827,43860,44640,
50879,77532,81718,82016,95036,98982,100285.

The Primes for 37615 to 44640 are reported from Kimmo Herranen Dec 1998.

Searching in two ranges for n: 1) 1 to 250k 2) 250k to 1M
Actually the first range is up to 130k and the second up to 320k.

Reserving 555567045

I'll try 165054615 again from n=250k

new
 

475977645*2^137484-1 is prime

475977645*2^145568-1 is prime!

Reserving k=465, from the main 15k stats page. Looks like the longest list of primes around for a smallish number.

There is a new update for the main 15k stats page, including all the reservations in this thread (shaded pink). I'll email it to Kosmaj this afternoon. If you get a chance, check the page for your reservations, as once I get the page caught up, I can keep up on it pretty easily.

I'll next post the small-primes thread listings to the page, which I think will take a while!
-Curtis

I am still working on k=736320585. My current status is n=500000. There are also some primes missing for this "k": 736320585*2^339426-1, 736320585*2^363497-1, 736320585*2^371961-1, 736320585*2^479381-1, 736320585*2^482897-1 :smile:

35388067 is done up to 1M and no prime found yet.
i'm sieving this k from 1M to 5M: actually there are 679 n up to 2M
and 2663 up to 5M in all. sieved till 13B and further.
353437897 is tested to 773k. no new prime.
352744289 tested up to 247k and no prime. sieved till 22B and 968 n's left up to 1M.
20141 tested till 847k, 27253 up to 801k and 31511 up to 787k. no primes.
50227 tested up to 283k -> no new primes
57943 up to 268k: new primes nor n=52287,62475 and 76335!
thats's all for now.

k=1515 tested till n=500000, I'm still working on it :smile: