The Second Megabit Drive - Page 24

pinhodecarlos · 2014-05-10, 17:12

1620-1621 complete, no primes.

kracker · 2014-05-10, 18:10

1662-1670 no primes

pinhodecarlos · 2014-05-10, 19:40

kracker,

About your smilie. Let me teach you one thing I learned. You need a lot of patience to find primes and what I usually think when I reserve a range, rather than always expecting a prime, is to help RPS to clean the low boundaries of k<300 (check here http://www.15k.org/riesellist.html). This means that I am always concerned when the range will be completed than expecting a prime. In this way I won't get frustrated.
Finally primes will appear when you least expect, as often occurs with me.

Happy hunting!

Carlos

Nooby · 2014-05-10, 19:46

1590-1591
no prime

Nooby · 2014-05-10, 19:47

1591-1592 no prime

pinhodecarlos · 2014-05-10, 19:51

Meanwhile, if noticed, the files are on the server in chunks of 2k up to 1800.

kracker · 2014-05-10, 20:16

Quote:

Originally Posted by pinhodecarlos

kracker,

About your smilie. Let me teach you one thing I learned. You need a lot of patience to find primes and what I usually think when I reserve a range, rather than always expecting a prime, is to help RPS to clean the low boundaries of k<300 (check here http://www.15k.org/riesellist.html). This means that I am always concerned when the range will be completed than expecting a prime. In this way I won't get frustrated.
Finally primes will appear when you least expect, as often occurs with me.

Happy hunting!

Carlos

Sorry, semi-wrong smilie.

I'm not in it only for finding primes, I was just curious if I was normal and how common or rare primes were in this range.

VBCurtis · 2014-05-10, 22:38

Quote:

Originally Posted by kracker

Sorry, semi-wrong smilie.

I'm not in it only for finding primes, I was just curious if I was normal and how common or rare primes were in this range.

There are definitely estimates available to find number of candidates per prime over the long run, provided exponent and sieve depth. Rather than bother with such calculations, refer to post 1 of any team drive and have a peek at how many primes have been recently found. On this drive, it appears we've had 4 primes in the last 100k n-range. This rate is inversely proportional to the exponent, but for current tests it suggests 1 prime per 25k is a reasonable guess for how common primes are. Of course, individual results are in no way regular- 2 primes in a 5k block or 60k without a prime are both entirely reasonable.

I'd provide you the formula for tests per [expected] prime, but I don't have it handy and I'm lazy.

Kosmaj · 2014-05-11, 00:45

Taking 1680-1684.

kracker · 2014-05-11, 01:00

Quote:

Originally Posted by VBCurtis

There are definitely estimates available to find number of candidates per prime over the long run, provided exponent and sieve depth. Rather than bother with such calculations, refer to post 1 of any team drive and have a peek at how many primes have been recently found. On this drive, it appears we've had 4 primes in the last 100k n-range. This rate is inversely proportional to the exponent, but for current tests it suggests 1 prime per 25k is a reasonable guess for how common primes are. Of course, individual results are in no way regular- 2 primes in a 5k block or 60k without a prime are both entirely reasonable.

I'd provide you the formula for tests per [expected] prime, but I don't have it handy and I'm lazy.

Thanks

kracker · 2014-05-15, 16:56

1670-1680 done. No primes

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2014-05-10, 19:40	#256
pinhodecarlos "Carlos Pinho" Oct 2011 Milton Keynes, UK 11523₈ Posts	kracker, About your smilie. Let me teach you one thing I learned. You need a lot of patience to find primes and what I usually think when I reserve a range, rather than always expecting a prime, is to help RPS to clean the low boundaries of k<300 (check here http://www.15k.org/riesellist.html). This means that I am always concerned when the range will be completed than expecting a prime. In this way I won't get frustrated. Finally primes will appear when you least expect, as often occurs with me. Happy hunting! Carlos

2014-05-10, 19:51	#259
pinhodecarlos "Carlos Pinho" Oct 2011 Milton Keynes, UK 3×17×97 Posts	Meanwhile, if noticed, the files are on the server in chunks of 2k up to 1800.

2014-05-11, 00:45	#262
Kosmaj Nov 2003 E26₁₆ Posts	Taking 1680-1684.