Thread: Arithmetic number puzzle
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Old 06-12-2010, 05:42 PM   #3
obs20
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Quote:
Originally Posted by pdurrant View Post
OK, after the last one, here's one that's purely arithmetic.

9, 14, 7, 11, 17, 26, 13, 20, 10, 5, ?, ?, ?, ?

What are the next four numbers in this sequence?
What are the rules to this sequence?
Why have I only asked for four more terms?

Don't forget to enclose answers in spoiler tags.
Maybe this is it?
Spoiler:
8,4,2,1 after that it repeats 2,1,.....The rule: if the number is odd f(x)=(x+1)/2 if the number is even the next element is f(x)= x/2
Last edited by obs20; 06-12-2010 at 08:04 PM.
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