Simply take your post number (for instance mine is the first), and take the natural log of it. For instance let's say your post is the 26th one on this thread. You would take the natural logarithm of it (In), which is 3.25 and add it to the result of the previous post. In should be on any scientific calculator.
I'll start: In(1)=0
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Sebastian
"Don't forget to floss." - Darkwing Duck