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Old 2021-02-11, 06:55   #1959
Happy5214
 
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Quote:
Originally Posted by Trilo View Post
55*2^2048305-1 is prime! (627441 digits)
That range was already tested by Kosmaj. Luckily I found it on PrimePages. It's 55*2^2084305-1.

Last fiddled with by Happy5214 on 2021-02-11 at 06:55 Reason: Linking to PrimePages
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Old 2021-03-06, 09:13   #1960
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Code:
195*2^4685711-1 is prime! (1410542 decimal digits)
https://primes.utm.edu/primes/page.php?id=132121

k<300 highest Nash weight k delivers again.
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Old 2021-03-06, 19:32   #1961
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Quote:
Originally Posted by kuratkull View Post
Code:
195*2^4685711-1 is prime! (1410542 decimal digits)
https://primes.utm.edu/primes/page.php?id=132121

k<300 highest Nash weight k delivers again.

Congratulations!
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Old 2021-03-18, 08:38   #1962
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285*2^1801236-1 is prime
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Old 2021-04-05, 17:41   #1963
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Been a while:
99*2^2658496-1 is prime! (800290 digits)
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Old 2021-04-12, 05:34   #1964
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From the 3rd megabit drive:

257*2^2108554-1 is prime :-)
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Old 2021-04-26, 16:40   #1965
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A pair from the 3rd megabit drive:


235*2^2163273-1
219*2^2178673-1


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Old 2021-04-29, 20:22   #1966
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Code:
197*2^4765318-1 is prime! (1434506 decimal digits)

https://primes.utm.edu/primes/page.php?id=132236
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Old 2021-06-27, 11:11   #1967
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21*2^2959789-1 is prime
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Old 2021-09-07, 18:27   #1968
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The largest prime for 2021 and 2nd largest since Christmas 2018 has been discovered.

It is a 3 2 1 Prime i.e. 3*2k-1 The prime is 3*217748034 -1 and has 5342692 digits.

This is the largest known prime for the 3*2^n-1 form.

Currently it stands in position 18 overall and is the 6th Non-Mersenne prime in size.

Congratulations to Mark Wiseler and the PrimeGrid group.

Last fiddled with by VBCurtis on 2021-09-08 at 00:01 Reason: Fixed the "+1" to be the correct -1
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Old 2021-09-07, 21:48   #1969
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Quote:
Originally Posted by rudy235 View Post
It is a 3 2 1 Prime i.e. 3*2k+1 The prime is 3*217748034 -1 and has 5342692 digits.
So, is it +1 or -1?

Edit: I can see that it's almost certainly the -1 form from the next line in the post, but it's still confusing with the first line contradicting it.

VBCurtis: I fixed the post.

Last fiddled with by VBCurtis on 2021-09-08 at 00:01
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