Trick of Mind

11 Responds so far- Add one»

1. 1. Nathan Said：
   February 3rd, 2011 at 10:39 pm

   -279
2. 2. luv2fap Said：
   February 3rd, 2011 at 10:40 pm

   Nope.
3. 3. Nathan Said：
   February 4th, 2011 at 12:27 pm

   18

   Reverse the digits, and the sequence is the square numbers
4. 4. anon Said：
   February 4th, 2011 at 3:48 pm

   just curious, how did you get -279?
5. 5. Chris Said：
   February 4th, 2011 at 9:37 pm

   Sounds good to me. I’ll vote for 81 too.
6. 6. Chris Said：
   February 4th, 2011 at 9:54 pm

   Aaargh. I meant 18. Night all.
7. 7. Nathan Said：
   February 5th, 2011 at 12:07 pm

   polynomial interpolation
8. 8. Nasruddin Said：
   February 6th, 2011 at 4:38 am

   48
9. 9. Karl Sharman Said：
   February 6th, 2011 at 8:29 am

   18 – three or four days late.
10. 10. luv2fap Said：
    February 6th, 2011 at 5:10 pm

    Nathan is correct, it was the square of consecutive numbers starting from 4 with the digits reversed.
11. 11. Chris Said：
    February 6th, 2011 at 8:42 pm

    Hi Nathan. I’ve just worked out that your comment “Polynomial interpolation” was how you arrived at -279.

    Because the difference table doesn’t reduce to a constant, it wasn’t reasonable to use that mthod.

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