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:<math>\frac{1+z}{(1-z)\left(z^2 - 34z + 1\right)} = 1 + 36z + 1225 z^2 + \cdots</math>
The [[Digital root]] of every Square triangular number (expect 0) is 1 if the number has a even index and 9 if it has odd index.
==Numerical data==
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