Summation question

*To*: mathgroup at smc.vnet.net*Subject*: [mg85664] Summation question*From*: Robert Pigeon <robert.pigeon at videotron.ca>*Date*: Tue, 19 Feb 2008 01:47:46 -0500 (EST)

Good day all, I want to make a summation like this: Sum[f[i],{i, start, finish}]. What I want is that the sum be over a specific set like {1,3,5,7,11,13}. So the sum would be : f[1]+f[3]+f[5]+f[7]+f[11]+f[13]. The set I want to use is the primes. So, how do I use, if possible, Sum over a specific set ? Thanks, Robert Robert Pigeon

**Follow-Ups**:**Re: Summation question***From:*Sseziwa Mukasa <mukasa@jeol.com>