Understanding Logs

[quddusaliquddus]

Hi.
How would I go from seeing the pattern in the number of nines in the first n numbers, to writing the following formulae for it:

n*(9/10)^log_10(n)

I don't get how to put the log in (or how it works). Sorry, it is an easy question. Please help.

[geometer]

One method would be to draw a graph of the number of 9s vs the number n, then fit a curve to it. This would, I think, require a computer since this is obviously not an intuitive relationship.

[quddusaliquddus]

I want to delete this thread: Don't know how to!!

[moshek]

way you want to delete it ? :confused:

[quddusaliquddus]

I don't need the answer...pls dnt ask y - loong story i'd rather not say.

I apologise for wasting your time.