2655-2660 complete, no primes

2675-2680 complete, one prime (870667875 267981)
Taking 2695-2700.

New files in the 270-280k range sieved to 2150bn are now available.

BTW, here is the number of candidates per k in the 270-280k range sorted in their decresing order together with the number of primes found so far.[CODE]
k #cand #primes
870667875 1461 4
1952775825 1455 3
804003525 1415 3
460735275 1408 3
3467560635 1403 0
918332415 1367 4
697942245 1310 2
2022381375 1303 5
1738812075 1291 1
1626176475 1285 2
779602395 1283 0
1694614845 1278 3
663301485 1271 1
3276742755 1250 3
1325978745 1241 3
67342275 1211 1
[/CODE]Overall in the 200-400 range the order is slightly different but the first and the last [I]k[/I] are the same.

Observations:
1) k=3467560635 has a lot of candidates surviving sieving yet it is together with k=779602395 without primes. :sad:
2) k=2022381375 is in the middle by number of candidates but it produced the largest number of primes (5). :smile:
3) k=870667875 on the top produced many primes as expected (4). :ermm:
4) k=3276742755 and k=1325978745 are near the bottom but with 3 primes each they are the most prolific. :cool:

2685 to 2690 complete, no primes :(

Dr. Mike.. :rant:

Yeah, no primes in your range, a major problem :surprised :wink:

But how about those 3 you reported yesterday? :cool:

2660-2665 complete, one prime already reported
804003525 266132

Taking 3 files: 2700-2715.

Taking 3 files: 2715-2730

2665-2670 complete, no primes.

An early prime at the 270k level:
1738812075 270036, 81299 digits

The 2nd prime for this [I]k[/I].

779602395*2^270175-1 is prime! 81340 digits

The first prime for this [I]k[/I] :surprised and the 40th prime in this drive! :shock:

2720-2730 complete (2 files), 4 primes :banana:

1738812075 272308
870667875 272449
870667875 272494
918332415 272910

Taking 3 files: 2730-2745