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Old 2021-09-15, 16:19   #1175
James Heinrich
 
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"James Heinrich"
May 2004
ex-Northern Ontario

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Quote:
Originally Posted by kriesel View Post
OBD progress level on https://www.mersenne.ca/obd seems to me off by .01. It currently indicates 21.09, while there are 8, not 9, completed to 88 bits or more.
If you mouseover the "OBD Progress Level" text you see
Quote:
There will be 23 steps from Level 21 to Level 22: getting candidate #22 to 87 bits and getting each candidate from 87 to 88 bits. Each of these steps will be indicated with a decimal point (21.01, 21.02, through 21.22, then 22.00)
The logic was derived from this post: https://www.mersenneforum.org/showth...301#post519301
Extending that a bit:
Quote:
Level 23 will be 23 candidates trial factored to at least 89 bits.
Level 22 will be 22 candidates trial factored to at least 88 bits.
Level 21 will be 21 candidates trial factored to at least 87 bits.
Level 20 will be 20 candidates trial factored to at least 86 bits.
Level 19 is 19 candidates trial factored to at least 85 bits.
Level 18 is 18candidates trial factored to at least 84 bits.
We have reached level 21.00 with at least 21 candidates at 87+ (there are 45).
Then to paraphrase lavalamp from the above post:
Quote:
So 21.00 was 21 candidates at 87 bits, then we add on:
+0.01 for 22nd candidate to 87 bits
+0.01 * 8, since there are now 8 candidates at 88+ bits
Making the current level 21.09.

Last fiddled with by James Heinrich on 2021-09-15 at 16:19
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