Riesel Primes k*2^n-1, k<300 [Was "k=1"]

[grobie]

Releasing k=267 to RPS

Taking k=199 from n=250k

[sjtjung]

Report for 103 and 207:

103 is LLRing at 491k

207 is still sieving.


-Steven

[grobie]

199*2^301193-1 (90671 digits)

[Thomas11]

k=11 has reached n=1.4M,
k=29 has reached n=1.7M.

[Flatlander]

k = 35 now tested to > 600k.

[lsoule]

I've stopped k=195 at n=713.8k and would like to release this k.

I'd now like to reserve k=33 (starting at 500k).

Status of other k<300:

39 is at 831k
69 is at 853k
181 is at 633k
223 is at 1.34M
231 is at 946k

[Cruelty]

k=25 tested till n=900000 - I'm still working on it

[Kosmaj]

I usually update my status directly in the stats page, but for the record here it is:

k=7, at 1.6M
k=21, at 1M
k=73, at 804k (will stop at 1M)
k=77, at 1267k and 1465-1500k
k=83, at 543k (got a sieve file from grobie, will stop at 550k)
k=87, at 890k (most likely will stop at 1M)
k=97, at 900k (would like to go to 1M)
k=177, at 850k
k=193, at 730k (will stop at 1M)
k=277, at 744k (will stop at 1M)
k=285, at 365k (passing to RPS 5th Drive at 470k)

Needless to say, I don't and cannot work on all reserved Ks all the time, but I'm trying to push them all little by little.

[grobie]

199*2^332985-1 (100241 digits)

[Kosmaj]

k=83 checked in the 536,800-550,000 range using a sieving file provided by grobie, no primes.

k=83 is similar to k=65, the weight is medium (around 2050 meaning more than 45 candidates per 1000 n's after sieving to more than 500bn), but both have relatively large primeless holes in the 200-500k range:

k=65: 185,946 - 578,512
k=83: 216,954 - x, where x > 550,000 remains to be found.

[Kosmaj]

Taking k=173.
It's the least processed k<300, to 210k only, and one known prime at 360k.
I'll sieve 210k-1M but will stop early to do tests to 300k.

I've been also sieving k=253 for a while in the n=1-3M range. It's the only k<300 with no known gigantic primes (with more than 10,000 digits). No plans to start testing yet...