Author： Nelsen Roger B.
Publisher： Mathematical Association of America
E-ISSN： 1931-1346|46|3|172-172
ISSN： 1931-1346
Source： The College Mathematics Journal, Vol.46, Iss.3, 2015-05, pp. : 172-172
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Abstract
We show wordlessly that each triangular number except 1 and 6 is a sum of three triangular numbers.
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