Number Theory Problem #1729
Rusty the Fox is studying Mobius - function. But he thinks it is crappy so he starts Tilted Towers function, which is inverse of Mobius function. Therefore, find sum of Tt(1) + Tt(2) + Tt(3) ... ... ... where, Tt(x) = TT(15^x)/15^x, where x is an integer and TT(x) is Tilted Towers function.
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