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Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!linus!bs
From: bs@linus.UUCP (Robert D. Silverman)
Newsgroups: net.math
Subject: Re: series sum
Message-ID: <149@linus.UUCP>
Date: Fri, 24-Jan-86 08:34:19 EST
Article-I.D.: linus.149
Posted: Fri Jan 24 08:34:19 1986
Date-Received: Sun, 26-Jan-86 04:41:17 EST
References: <2265@utcsstat.uucp>
Organization: The MITRE Corporation, Bedford, MA
Lines: 15

> 
> 	Can anyone deduce the sum of the following series after n terms?
> 
> 	  1 + 3 + 6 + 10 + 15 + 21 + .....
> 
> -- 
> 
>        	{allegra,ihnp4,linus,decvax}!utzoo!utcsstat!anthony
>         {ihnp4|decvax|utzoo|utcsrgv}!utcs!utzoo!utcsstat!anthony

The n'th term is:  n(n+1)(n+2)
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Bob Silverman