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Old 2021-06-07, 20:34   #2
ryanp
 
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Jun 2012
Boulder, CO

4618 Posts
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Quote:
Originally Posted by sweety439 View Post
Can someone check whether (31^(2^20)+1)/2, (31^(2^21)+1)/2, etc. is probable prime or not?
Why can't you check them yourself?

1. Download sllr64: http://jpenne.free.fr/index2.html
2. Run it:

Code:
 ./sllr64 -d -t8 -q"(31^131072+1)/2"
Starting probable prime test of (31^131072+1)/2
Using all-complex AVX-512 FFT length 32K, a = 3

31^131072+1)/2 is not prime.  RES64: A26F6DFC06756BFA. 
OLD64: 92BDE0A717A043E9  Time : 42.352 sec.
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