0
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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