Other Primes

[carpetpool]

Another lucky hit:

26*3^1700041+1 may be prime, but N divides 3^((N-1)/3))-1, restarting with a=5 Time : 938.494 sec.
26*3^1700041+1 is prime! (811128 decimal digits) Time : 946.942 sec.

[rudy235]

TO BE VERIFIED

Congratulations to Serge Batalov.

Gaussian Mersenne. #20 on the current list.

2^15317227 + 2^7658614 + 1

4,610,945 digits.

[pepi37]

Originally Posted by rudy235

TO BE VERIFIED

Congratulations to Serge Batalov.

Gaussian Mersenne. #20 on the current list.

2^15317227 + 2^7658614 + 1

4,610,945 digits.

Serge never publish prime until he is 101% sure it is prime :)

[rudy235]

Originally Posted by pepi37

Serge never publish prime until he is 101% sure it is prime :)

Well, 101 happens to be prime.

[paulunderwood]

Congrats to Scott Brown for the "321+" prime, 3*2^16408818+1, which was 6.5 years in the making by PrimeGrid.

[kar_bon]

Seems a new prime for the Riesel Problem was found: 146561*2^11280802-1 found by PrimeGrid's project currently in verify status.
This is, when proven, almost 3 years after the last found for this problem.

[paulunderwood]

Congrats to a1call for this top5000 prime of a most unusual construction.

[sweety439]

Originally Posted by kar_bon

Seems a new prime for the Riesel Problem was found: 146561*2^11280802-1 found by PrimeGrid's project currently in verify status.
This is, when proven, almost 3 years after the last found for this problem.

this number is now proven to be prime, now there are 47 Riesel base 2 candidate left.

[kar_bon]

Originally Posted by sweety439

this number is now proven to be prime, now there are 47 Riesel base 2 candidate left.

No, that page was already updated: there're still 48 k-values left.

[pepi37]

New 1.43M repdigit prime will appear soon :)
It was time to find something bigger after 5 years searching in this sequence :)

[Batalov]

Good! Congratulations!