My first problem!

Algebra Level 4

\[1 \cdot 4 + 4 \cdot 7 + 7 \cdot10 + 10 \cdot13 + \cdots + 97\cdot100 \]

Find the sum of digits of the value of the sum above.

For example, if the sum is 12, then submit your answer as \(1+2=3\).

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