Not Wallis Product

Algebra Level 4

1+15+1×35×10+1×3×55×10×15+ 1 + \frac {1}{5} + \frac {1 \times 3}{5 \times 10} + \frac {1 \times 3 \times 5}{5 \times 10 \times 15} + \cdots

The series above can be expressed in the for of ab \sqrt{ \dfrac a b } , where aa and bb are coprime positive integers.

What is the value of a+ba+b?

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