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Old 2010-07-25, 02:45   #12
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Talking Prime found!

Prime found! The first search is finished:
145048 * 37544096 + 1 (14647 digits)

Although, still shit out of luck for the other one. 22 hours, got nothing.
Next search: Generalized Proth: k * 2611300 + 1 (15995-15996 digits). I'll let it sieve for the night.

Last fiddled with by 3.14159 on 2010-07-25 at 03:40 Reason: Timing incorrect!!!
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Old 2010-07-25, 11:37   #13
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Hmm.. The search has surprisingly yielded nothing at all, after 30 hours. Even at worst case odds, 1 in 46k, I was supposed to have a prime 12 hours ago.

Last fiddled with by 3.14159 on 2010-07-25 at 11:47
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Old 2010-07-25, 13:14   #14
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More submissions: 201181 * 2611300 + 1 (15995 digits). That one was relatively quick compared to the other searches. Sieved up to 1 trillion. Hopefully something comes up soon for the other search.
10222 * 61800 + 1 (1405 digits)
6352 * 62300 + 1 (1794 digits)
8440 * 62300 + 1 (1794 digits)
7736 * 62302 + 1 (1796 digits)
7737 * 63100 + 1 (2417 digits)
12148 * 63100 + 1 (2417 digits)

A power interruption ruined the main search. I remember the cutoff value for k, however, so it's no great loss. The only downside: I'm going to have to do 2-4 hours of sieving. Again.

Last fiddled with by 3.14159 on 2010-07-25 at 13:59
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Old 2010-07-25, 15:35   #15
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More submissions: 8166 * 144500 + 1 (5162 digits)
21615 * 144500 + 1 (5162 digits)
11558 * 62600 + 1 (2028 digits)
14446 * 62600 + 1 (2028 digits)
6818 * 62640 + 1 (2059 digits)
7586 * 62760 + 1 (2152 digits)
11422 * 62880 + 1 (2246 digits)
27571 * 63100 + 1 (2417 digits)
28548 * 63100 + 1 (2417 digits)

Last fiddled with by 3.14159 on 2010-07-25 at 16:14
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Old 2010-07-25, 18:07   #16
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More submissions: (Base: 18, Exponent: 3900): Range tested: 26k to 46k:
26880 * 183900 + 1 (4900 digits)
28796 * 183900 + 1 (4901 digits)
29370 * 183900 + 1 (4901 digits)
32730 * 183900 + 1 (4901 digits)
34168 * 183900 + 1 (4901 digits)
35523 * 183900 + 1 (4901 digits)
37313 * 183900 + 1 (4901 digits)
42612 * 183900 + 1 (4901 digits)

Also: Still sieving for the k * 779068192 + 1 prime. I'm planning on doing at least 2x the sieving I did last time around.

Last fiddled with by 3.14159 on 2010-07-25 at 18:32
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Old 2010-07-25, 19:42   #17
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540*54^4700+1 ...
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Old 2010-07-25, 19:55   #18
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Quote:
Originally Posted by 3.14159 View Post
3. Is not a "small" prime. (Please ensure it is ≥ 1000 digits.)
See Sloane's A074282.
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Old 2010-07-25, 20:00   #19
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Quote:
Originally Posted by 3.14159 View Post
Prime posting thread.
(...)

1. Has no factors below 230
This is more important!

I have to check, if I can find a prime with a factor > 2^30!

Sorry, this had to be written here!

Last fiddled with by kar_bon on 2010-07-25 at 20:03
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Old 2010-07-25, 20:08   #20
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probable prime maybe
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Old 2010-07-25, 20:10   #21
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Quote:
Originally Posted by CRGreathouse
See Sloane's A074282.
... *Picard facepalm* Thank you for the barely qualified primes.

Quote:
Originally Posted by kar_bon
I have to check, if I can find a prime with a factor > 2^30!
.. Dammit, you get the idea. Trial divide to 230.
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Old 2010-07-25, 21:52   #22
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Quote:
Originally Posted by 3.14159 View Post
... *Picard facepalm* Thank you for the barely qualified primes.
Yes, I saw the qualification and typed
Code:
nextprime(10^999)-10^999
into Pari.
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