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Interesting Sequence (5) (Posted on 2004-11-07) Difficulty: 4 of 5
1, 3, 5, 7, 9, 15, 17, 21, 27, __, __, __, ...

What are the next three numbers in this sequence?

  Submitted by SilverKnight    
Rating: 4.3333 (6 votes)
Solution: (Hide)
31, 33, 45.

Each number is the decimal value for the sequence of palindromic binary numbers, starting with (and finishing with) a 1. ie. 1=1, 3=11, 5=101, 7=111, 9=1001, 15=1111, 17=10001, 21=10101, 27=11011, 31=11111, 33=100001, 45=101101.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionPuzzle SolutionK Sengupta2007-03-09 04:36:32
re: The Full Solution - Just repeated By me as I missed writing subject in my previous one.nikki2005-01-25 13:55:39
SolutionThe Full Solution - Just repeated By me as I missed writing subject in my previous one.Pemmadu Raghu Ramaiah2005-01-25 13:50:32
SolutionNo SubjectPemmadu Raghu Ramaiah2005-01-25 13:48:35
SolutionDifferent concept to other postsbrianjn2004-11-10 20:25:09
SolutionSOLUTION++++Ady TZIDON2004-11-07 15:59:39
SolutionSolution with hint (spoiler)SteveH2004-11-07 11:14:50
SolutionSolution, no explanation.Juggler2004-11-07 09:50:30
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