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January 30, 2015

January 30, 2015

Posted by **Ben** on Monday, September 24, 2007 at 8:07pm.

- math -
**tchrwill**, Tuesday, September 25, 2007 at 1:58pmThe smaller of two triangular numbers whose sum and difference are also triangular numbers?

21 - 16 = 6

21 + 15 = 36

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