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Seq.(Seq.(Seq.)) seeking sod (Posted on 2009-03-01) Difficulty: 2 of 5
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 base-10 digits of n.

No Solution Yet Submitted by K Sengupta    
Rating: 1.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: True but unprovableDaniel2009-03-02 19:34:39
Some ThoughtsTrue but unprovableSteve Herman2009-03-02 11:05:47
SolutionWorking BackwardsSteve Herman2009-03-01 13:27:28
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