Sum in Harmionic Series

From: Narasimham G.L. (mathma18_at_hotmail.com)
Date: 08/23/04 

Date: 23 Aug 2004 03:08:02 -0700

Is there a formula for sum of n terms of harmonic progression
[1/a,1/(a+d),1/(a+2d), ... 1/(a+(n-1)d)]? When n-> Inf there may be a
result with Log and Euler's number.