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Tricky sequence

  1. Aug 14, 2011 #1
    The sequence is 1,2,3,4,5,8,7,16,9

    I am absolutely stumped and cannot fathom the answer. Normally I can see the logic, can anyone help with the rule?

    Thank you
  2. jcsd
  3. Aug 14, 2011 #2
    Can you provide more terms? :smile:

    Alright, heres my guess...the next 6 terms are 32, 11, 64, 13, 128, 15

    The sequence is the positive integers. The odd numbers remain unchanged, the even numbers are replaced by powers of 2

    2 is replaced by 2^1

    4 is replaced by 2^2

    6 is replaced by 2^3

    8 is replaced by 2^4

    You get the idea? :smile:
    Last edited: Aug 14, 2011
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