Primo/FastECPP reservation thread

[Grotex]

I reserve M87691 cofactor (prp26371)

[Grotex]

Originally Posted by Grotex

I reserve M87691 cofactor (prp26371)

Drop it
I have only quad thread laptop

[Batalov]

Ok, will do M87691 cofactor (prp26371)

[paulunderwood]

Originally Posted by Batalov

Ok, will do M87691 cofactor (prp26371)

Ryan said he'd do it in this post: https://mersenneforum.org/showpost.p...&postcount=125 Perhaps the task lapsed. (I certified cofactor of M86137 with Primo.)

[paulunderwood]

Originally Posted by sweety439

(71^16384+1)/2, 30331 decimal digits

this PRP is <SNIP>

Please use this thread to reserve/unreserve and report outcomes of ECPP work,

Do not advertise numbers in order to try and get other people to do work for you. Just stop it, You have been warned many times about this kind of behaviour. Consider this the last warning.

NOTE: Offending post moved to thread for off-topic posts in author's blog.

[paulunderwood]

Originally Posted by paulunderwood

After running about 1 hour per test for the first 10 tests, the program terminated after 3 days.

I am now attempting the slightly larger M174533 cofactor (prp52494) instead

Done: Certified and registered at The Prime Pages and factorDB.

Reserving the M216317 cofactor (prp65046).

[paulunderwood]

Originally Posted by paulunderwood

Reserving the M216317 cofactor (prp65046).

This number failed at Size [8] 215618 bits with: mu_div_qr GNU MP assertion failed cy == 0.

I am now attempting to certify the cofactor of M221509 (prp66673).

[paulunderwood]

Originally Posted by paulunderwood

This number failed at Size [8] 215618 bits with: mu_div_qr GNU MP assertion failed cy == 0.

I am now attempting to certify the cofactor of M221509 (prp66673).

The same error has occurred at Size [2]. Where is this bug?

Taking W127031.

[sweety439]

Originally Posted by paulunderwood

The same error has occurred at Size [2]. Where is this bug?

Taking W127031.

Primo seems to have a limit of 160000 bits

[paulunderwood]

Originally Posted by sweety439

Primo seems to have a limit of 160000 bits

This is Enge's ecpp-mpi program.

[sweety439]

Originally Posted by paulunderwood

This is Enge's ecpp-mpi program.

OK, also you can see https://oeis.org/A092559, current the larger prime factor of 2^A092559(n)+1 have been proven prime for all a(n) up to a(52) = 117239, why you skip a(53) = 120788 and prove a(54) = 127031?