Create a triangle from the sequence of odd numbers s[n]=2n-1 by writing s[1] on the first row, s[2] and s[3] on the second row, the next three numbers from the sequence on the third row, ... the next k numbers on the k-th row. For example:

The vertical column contains the sums by row of the numbers in the triangle. It is easy to see that this column contains the cubic numbers.

2-2018 Teaching by misleading

2 months ago

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