2 Nov
2007
2 Nov
'07
4:43 p.m.
From the October, 2007 American Mathematical Monthly:
<< E 496 [1941, 699]. Proposed by R.V. Heath, New York, NY. What is the smallest value of n for which the n^2 triangular numbers 0,1,3,6,10,...,(n^2)(n^2-1)/2 can be arranged to form a magic square? Solution by Christian Boyer, Enghien les Bains, France. The answer is . . . . . . . . . [Editor's note: In 66 years, no other solutions were received.]
--Dan P.S. Solution is omitted in case anyone wants to work on this, though I suspect this problem has already been discussed here. (Has it?) P.P.S. Does anyone know of a longer interval between the publication of a Monthly problem and the first solution received?