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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}]


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