From: Robin Chapman Subject: Re: A Unique sum(n^2) = 70^2 Date: Tue, 22 Feb 2000 16:45:02 GMT Newsgroups: sci.math Summary: [missing] In article <88ub0n$ker$1@news.gov.on.ca>, "Bob Forslund" wrote: > It is known (and has been proven) that: sum(n^2) = 70^2 (n=1 to 24) > I know that sum(n^2) (n=1 to N) is N(N+1)(2N+1)/6 > > I cannot locate the proof and would like to know how they proved > that this is true only for N=24 in which case the sum is 70^2. > Can anyone shed some light on this for me? > > Your help would be appreciated. > This is self study - not homework. W. S. Anglin, `The square pyramid puzzle', American Mathematical Monthly vol. 97, pp. 120--124 (1990). -- Robin Chapman, http://www.maths.ex.ac.uk/~rjc/rjc.html "`The twenty-first century didn't begin until a minute past midnight January first 2001.'" John Brunner, _Stand on Zanzibar_ (1968) Sent via Deja.com http://www.deja.com/ Before you buy.