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Forum posts for A Friday Brain Teaser

beats me
Posted by Mona on Nov 20, 2009
Okay, I give up. What's the answer?

Posted by phduffy on Nov 20, 2009
5000

Posted by Mona on Nov 20, 2009
Okay .. what's the formula?

Posted by phduffy on Nov 20, 2009

It's not a formula.

Posted by Mona on Nov 23, 2009
Well, what's the pattern then? (Isn't a formula a pattern?)

Posted by phduffy on Nov 23, 2009

Here's a hint:

Zero
One
Two
Four
Five
Six
Eight
Ten
Forty
Fortysix
Sixty
Sixtyone
Sixtyfour
Eighty
Eightyfour
Five Thousand

If we were to allow negative numbers, -4 would be the only number in this sequence.