S643 is proven with [URL="http://primes.utm.edu/primes/page.php?id=115202"]6·643^164915+1[/URL] (463117 digits)

[QUOTE]S643 is proven with [URL="http://primes.utm.edu/primes/page.php?id=115202"]6·643^164915+1[/URL] (463117 digits) [/QUOTE]Nice again Serge. Told ya they come in pairs.:bow:
I still think we have another S6 in the works.

[URL="http://primes.utm.edu/primes/page.php?id=115249"]48*580^174782 - 1
[/URL]

I also have a [URL="http://primes.utm.edu/primes/page.php?id=115256"]small one[/URL]. Here today, gone tomorrow.

R318
 

That makes R318 a 1ker. Nice

Serge is a prime finding machine lately.:banana:

78*916^120247-1
78*916^122431-1

R916 is proven :cool:

[QUOTE=unconnected;354976]78*916^120247-1
78*916^122431-1

R916 is proven :cool:[/QUOTE]

Very proven one might say :showoff:

[QUOTE=unconnected;354976]78*916^120247-1
78*916^122431-1

R916 is proven :cool:[/QUOTE]

Wow. I think that's the first time that finding 2 primes close together for the same k to prove a base has happened at CRUS. A few years ago, Max and I separately found primes for the same k on S16 in different reserved ranges but it didn't prove the base. I think it also might have happened on our PRPnet server at one time or another but once again, never for a proof.

Congrats!

After a long dry spell: 52*701^163776+1 is prime. At 466063 digits, this will make it in at #5 on the largest CRUS Sierpsinki primes to prove a conjecture.

Nice Mark. It has been a while.:party:

A well-deserved break, Mark! Congrats!