Number series

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Which is next number in the series
9 15 17 21 ....

Comments

  1. AdminJanuary 30, 2011 at 8:54 PM

    any explanation...

    ReplyDelete
  2. gaurav February 2, 2011 at 4:05 PM

    take their binary number and see the pattern

    ReplyDelete
  3. AdminFebruary 2, 2011 at 5:27 PM

    @gaurav correct answer these are palindromic number in their bitwise form..

    ReplyDelete

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