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Search took 0.01 seconds. Search: Posts Made By: Greenbank
Forum: Octoproth Search 2006-01-20, 16:04
Replies: 15
Views: 11,447
Posted By Greenbank
OK, n=56 is complete! Estimate was 280214. ...

OK, n=56 is complete!

Estimate was 280214.

Final count after isprime() PARI checking script: 285415

2^n = 72057594037927936 so I used a kmax of 72060T.

Output:
Forum: Octoproth Search 2006-01-19, 12:35
Replies: 15
Views: 11,447
Posted By Greenbank
n=55 [0,1E16] = 229947 n=55 [1E16,2E16] =...

n=55 [0,1E16] = 229947
n=55 [1E16,2E16] = 214250
n=55 [2E16,3E16] = 211102
n=55 [3E16,3.61E16] = 131672

Every 3-prp output by your program was indeed a prime! None failed the tests with PARI.
...
Forum: Octoproth Search 2006-01-16, 13:03
Replies: 15
Views: 11,447
Posted By Greenbank
If I put my whole G5 on it I can have n=55 done...

If I put my whole G5 on it I can have n=55 done in a shade under 2 days. I think this may be the limit of computing all Octoproths for a specific n. Let me check Robert's estimation formula:-
...
Forum: Octoproth Search 2006-01-16, 11:09
Replies: 15
Views: 11,447
Posted By Greenbank
Yeah, I meant to say 2^55 ~ 3.6E16. I was just...

Yeah, I meant to say 2^55 ~ 3.6E16. I was just trying to point out that 3E15 was an order of magnitude out.

2^55 = 36028797018963968
3.6E16 = 36000000000000000

robert44444uk, I'll send you an...
Forum: Octoproth Search 2006-01-16, 08:41
Replies: 15
Views: 11,447
Posted By Greenbank
2^55 = 3.6E16 So if you've done to 3e15 then...

2^55 = 3.6E16

So if you've done to 3e15 then you've only done 8.3%
Forum: Octoproth Search 2006-01-13, 16:00
Replies: 15
Views: 11,447
Posted By Greenbank
Nice work. f(49) = 55410 real count is...

Nice work.

f(49) = 55410

real count is 56905.
Forum: Octoproth Search 2006-01-13, 13:59
Replies: 15
Views: 11,447
Posted By Greenbank
Number of octoproths per n

All ranges checked from k=1 to 2^n (where 2^n-k would be 0).

All primes verified with PARI 2.1.7.

n<=26 op=0
n=27 op=1
n=28 op=2
n=29 op=1
n=30 op=1
n=31 op=2
Showing results 1 to 7 of 7

 
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