Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 exptools 1/6/84; site ihuxn.UUCP
Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!ihuxn!ttb
From: ttb@ihuxn.UUCP (Thomas T. Butler)
Newsgroups: net.puzzle
Subject: Series problem - from my 13 year old son
Message-ID: <827@ihuxn.UUCP>
Date: Mon, 10-Sep-84 09:01:28 EDT
Article-I.D.: ihuxn.827
Posted: Mon Sep 10 09:01:28 1984
Date-Received: Thu, 13-Sep-84 19:44:57 EDT
Organization: AT&T Bell Labs, Naperville, IL
Lines: 17

--
My 13 year old son gave me this "what's the next number in the
series" problem several days ago.  He says it's "simpy" and
everyone knows the answer, everyone but me that is.  I always
thought I was pretty good at this type of problem, but this
one has me stumped (though admittedly I haven't spent much
time on it).  How about the rest of you experts? Is this really
as "simpy" as my son claims?

What is the next number in the following series (and WHY)?

2  3  10  12  13  20  21

Thanks in advance for your erudite responses!
-- 
                           Tom Butler
                           ..!ihnp4!ihuxn!ttb