20160530, 23:19  #67 
"Mark"
Apr 2003
Between here and the
3×31×71 Posts 
(2^621443+1)^22 is prime! At 374176 digits, it is a about 14,000 digits short of the Top 5000.

20160531, 01:13  #68 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{3}·1,229 Posts 
Arrgh!
Still a very decent number! 
20160531, 02:49  #69 
Sep 2002
Database er0rr
1000000110010_{2} Posts 

20160601, 01:51  #70 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{3}·1,229 Posts 
(2482^18735+1)^22 is prime.
Now we only have two bases b=1656 (n<=70000) and b=2634 (n<=66000) that have no known primes under b<=3000. ____ EDIT: updated their search limits. Last fiddled with by Batalov on 20160618 at 19:01 
20160603, 14:03  #71  
"Rashid Naimi"
Oct 2015
Remote to Here/There
100011000011_{2} Posts 
Quote:
http://ckps.19.lc If there is an objection I will cancel the redirection. Preferably by at least a PM. Last fiddled with by a1call on 20160603 at 14:04 

20160606, 15:40  #72 
Jul 2003
2·307 Posts 
hi,
here are the results for carol / kynea b=60, n=1000 to 30000 (60^1717+1)^22 (60^3882+1)^22 (60^66651)^22 (60^11307+1)^22 (60^115491)^22 b=62, n=1000 to 30000 (62^15731)^22 (62^2183+1)^22 (62^3818+1)^22 (62^8800+1)^22 (62^110801)^22 (62^13352+1)^22 (62^17625+1)^22 
20160614, 21:17  #73 
"Mark"
Apr 2003
Between here and the
3×31×71 Posts 
(2^653490  1)^2  2 is prime! It will be in the 3700 range after it is verified.
Last fiddled with by rogue on 20160614 at 21:17 
20160614, 21:40  #74  
Sep 2002
Database er0rr
2·3·691 Posts 
Quote:


20160618, 13:05  #75 
"Mark"
Apr 2003
Between here and the
3·31·71 Posts 
(2^661478+1)^22 is prime at 398250 digits.

20160618, 14:39  #76 
Sep 2002
Database er0rr
2×3×691 Posts 

20160628, 05:29  #77 
I moo ablest echo power!
May 2013
2^{2}×449 Posts 
For base 26:
Code:
(26^743871)^22 is 3PRP! (1279.8199s+0.0082s) 
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