math
posted by Ben .
The smaller of two triangular numbers whose sum and difference are also triangular numbers?

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tchrwill
The smaller of two triangular numbers whose sum and difference are also triangular numbers?
21  16 = 6
21 + 15 = 36
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smallest of two triangular numbers whose sum and difference are also triangular numbers My guess would be 15. 21  15 = 6 and 15 + 21 = 36. 
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