Question about A018804

Leroy Quet qq-quet at
Thu Dec 4 00:01:23 CET 2003

As Pieter Moree 
pointed out, I made an error.

For one thing at least, 
|1/j(k) - 1/k| is NOT 
necessarily <= |2/n -1/(n-1)| < 1/n (or <= 1/k either)!

(I do not know *what* I was thinking)

But the result of
sum{k=1 to n} GCD(k,n) =
n *sum{k|n} phi(k) /k

seems to be right, at least.


Sorry + thanks,
Leroy Quet 

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