PUZZLET
087
A Matrix of Triangular Numbers
A Matrix of Triangular Numbers
| Twelve digits are arranged in a 4 x 3
matrix, forming four 3-digit integers by reading down, and three
4-digit integers by reading across. All seven integers are triangular
numbers. Your task: Reproduce the matrix, replacing
the letters A through M with digits.
(Note: there is only one solution).
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