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Forum: Prime Cullen Prime 2007-06-03, 06:48
Replies: 13
Views: 12,713
Posted By RedGolpe
Math explained

The chance of a random number n to be prime is 1/log(n) and for a random odd number, it of course becomes 2/log(n). See http://primes.utm.edu/howmany.shtml#3 for more information. I just don't see...
Forum: Prime Cullen Prime 2007-03-26, 12:49
Replies: 13
Views: 12,713
Posted By RedGolpe
If we assume that the chance of a random Cullen...

If we assume that the chance of a random Cullen number n=k\cdot 2^k+1 to be prime is

\frac{2}{\log{n}}\approx \frac{2}{\log{k}+k\log{2}}

then we have:
...
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