Re: Summation question

*To*: mathgroup at smc.vnet.net*Subject*: [mg85742] Re: Summation question*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Wed, 20 Feb 2008 07:05:38 -0500 (EST)*Organization*: University of Bergen*References*: <fpdu7v$qlq$1@smc.vnet.net>

Robert Pigeon wrote: > 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 ? > One of the many possibilities: Sum[f@Prime[i], {i, 1, 10}]