       Re: Summation question

• To: mathgroup at smc.vnet.net
• Subject: [mg85708] Re: [mg85664] Summation question
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Tue, 19 Feb 2008 07:08:23 -0500 (EST)

```s = Prime /@ Range

{2,3,5,7,11,13}

Total[f /@ s]

f(2)+f(3)+f(5)+f(7)+f(11)+f(13)

Plus @@ f /@ s

f(2)+f(3)+f(5)+f(7)+f(11)+f(13)

Sum[f[s[[i]]], {i, 6}]

f(2)+f(3)+f(5)+f(7)+f(11)+f(13)

Bob Hanlon

---- Robert Pigeon <robert.pigeon at videotron.ca> 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+f+f+f+f+f. 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
>
>

```

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