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S=9−139+1381−136561+1343046721−.......S = \displaystyle\sqrt{9 - \sqrt{\dfrac{13}{9} + \sqrt{\dfrac{13}{81} - \sqrt{\dfrac{13}{6561} + \sqrt{\dfrac{13}{43046721} - .......}}}}}S=9−913+8113−656113+4304672113−.......
If S=abS = \sqrt{\dfrac{a}{b}}S=ba where a,ba, ba,b are both primes, find a+ba + ba+b.
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