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# Help with twin prime formula watch

1. First of all sorry if my LaTex use isn't very good,

so using the formula:

with
to estimate the number of twin primes less than n

When I put in
I get the estimate to be

But when i cross check my answers with a website (link below) it says that for the estimate of twin primes should be

Just confused with where I'm going wrong, can some one help?
2. (Original post by dom979)
First of all sorry if my LaTex use isn't very good,

so using the formula:

with
to estimate the number of twin primes less than n

When I put in
I get the estimate to be

But when i cross check my answers with a website (link below) it says that for the estimate of twin primes should be

Just confused with where I'm going wrong, can some one help?
If you talk about Log[Log[n]]=Log^2(n) then answar will be 86.43 I dont know how you got 6.2

Sorry if does not help
3. I believe that he got the 6.2 by taking the log part as (log n)^2. However I do not know much else about this problem.
4. (Original post by dom979)
First of all sorry if my LaTex use isn't very good,

so using the formula:

with
to estimate the number of twin primes less than n

When I put in
I get the estimate to be

But when i cross check my answers with a website (link below) it says that for the estimate of twin primes should be

Just confused with where I'm going wrong, can some one help?
Where have you got this formula from?

The website you've linked to refers to the function which is a logarithmic integral - it's not just the log of something (or even its square)!

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