mersenneforum.org 77777*2^n+1
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 2022-07-30, 19:32 #1 Alex     "Alex_soldier (GIMPS)" Aug 2020 www.Mersenne.ru 3·7 Posts 77777*2^n+1 Hello. My next challenge is 77777*2^n+1 with n = [1..25.000.000] NASH = 374 (low weight) Sieved up to p = 1e14 Passed n = [1..1.000.000] (8119 tests). Code: 77777*2^15+1 is prime! (10 decimal digits, Trial divisions) Time : 0.282 ms. 77777*2^103+1 is prime! (36 decimal digits, APRCL test) Time : 20.084 ms. 77777*2^223+1 is prime! (73 decimal digits, APRCL test) Time : 245.466 ms. 77777*2^1063+1 is prime! (325 decimal digits) Time : 65.969 ms. 77777*2^34087+1 is prime! (10267 decimal digits) Time : 3.796 sec. - First found in 1999 by Pavlos Saridis Confirmed 5 small primes. No new primes found yet.
 2023-01-03, 21:43 #2 kar_bon     Mar 2006 Germany 57308 Posts Your edits in the PrimeWiki for reaching n=2M is not valid, as along as you don't give here a reference and a resultfile (zip for n=1 to 2.0M). Do not reactivate your old entry I've deleted today again.
2023-01-06, 23:19   #3
Alex

"Alex_soldier (GIMPS)"
Aug 2020
www.Mersenne.ru

3·7 Posts
Checked to n = 2.000.000

Quote:
 Originally Posted by kar_bon ...
Hello.
Status updated at 2022-11-30:

Sieved up to p = 1.7e14
Passed n = [1.000.001..2.000.000] (7563 tests).

No new primes found yet.
Attached Files
 Proth-k77777-n01M.zip (150.9 KB, 7 views) Proth-k77777-n02M.zip (150.7 KB, 14 views)

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