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Old 2013-12-25, 18:16   #18
davieddy
 
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"Lucan"
Dec 2006
England

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Quote:
Originally Posted by davieddy View Post
The expected primes per day for the whole project is 1/1500.
So the probability of one or more primes per day is 1 - e=1/1500 = 1/1500.5
@Phil: THX for allowing me to participate in the sort of mathsy fun which I enjoy.

Perhaps the 0.5 is worth looking into:

1 - e-1/X ~ 1/X - 0.5*(1/X)2
= (1/X)*(1 - 0.5*(1/X))
~ 1/(X*(1 + 0.5*(1/X))
= 1/(X + 0.5)

Wish I had done it that way first time.
Damn those calculators

D
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