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36 = 62 = Triangle(8)

The triangle number formula: T(n) = (n2+n)/2.

Here is T(8) graphically:

. 1 = T(1) = 1

.. +2 = T(2) = 3

... +3 = T(3) = 6

.... +4 = 10

..... +5 = 15

...... +6 = 21

....... +7 = 28

........ +8 = 36

36 = 62, graphically:

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