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Seq.(Seq.(Seq.)) seeking sod (Posted on 20090301) 

A sequence {S(x)}, each of whose terms is a positive integer, is defined as:
S(x) = x/2, if x is even, and:
S(x) = x+3, if x is odd
Given that n is an odd positive integer and, S(S(S(n))) = 27, determine sod(n).
Note: sod(n) denotes the sum of the base10 digits of n.
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Submitted by K Sengupta

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