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Old 2020-07-06, 17:00   #1662
sweety439
 
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The "top 10 primes" for R55 has the prime 68*55^29173-1, however, 68*55^1-1 = 3739 is prime, thus this prime is not the first prime for k=68
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Old 2020-07-06, 17:33   #1663
gd_barnes
 
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Quote:
Originally Posted by sweety439 View Post
The "top 10 primes" for R55 has the prime 68*55^29173-1, however, 68*55^1-1 = 3739 is prime, thus this prime is not the first prime for k=68

Good catch. This revealed an error in this base. k=608 (not k=68) was only tested up to n=25K. No prime was found. From this point forward k=608 was misread as k=68 and so k=68, despite having several small primes including at n=1, was tested for n>25K with a prime quickly found at n=29173.

So this brings to light the fact that k=608 has only been tested to n=25K and has never had a prime found.

I have updated the pages accordingly including removing the larger prime for k=68 and will begin a search 608*55^n-1 for n>25K.

Last fiddled with by gd_barnes on 2020-07-06 at 17:58
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Old 2020-07-06, 20:15   #1664
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An odd state of affairs here:

After all of that messing around with sieving 608*55^n-1 for n=25K-100K (and preparing to sieve n=100K-300K) because it was found to erroneously only have been tested to n=25K:

608*55^25062-1 is prime!

Found by the 5th test in the sieve file!

So R55 is back to 5 k's remaining.

Last fiddled with by gd_barnes on 2020-07-06 at 20:15
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Old 2020-07-19, 05:41   #1665
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Reserving S88 to n=500k (250-500k) for BOINC
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Old 2020-07-21, 18:11   #1666
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After milion nines:)

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K4 S53 at 1.61M


S53 -200K-305K -res sent to Gary
Base released ( except K4 of course)
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