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That should work. I had a different answer in mind.

If they worked out the code beforehand...

take a number, greater than 1. if odd, subtract 1, square it. if even, divide by 2. 2 -> 1 3 -> 4 -> 2 5 -> 8 -> 4 7 -> 36 --> 9 -> 16 -> 8 11 -> 100 -> 25 -> 576 -----> 9 13 -> 144 ----> 9 will this always hit a power of 2?

this one is pretty cute! Blonde v.s. Lawyer a lawyer sitting on a plane next to a Blonde want to pass some time and turns to her and says, "how about a trivia game, if i ask you a question and you get it right I'll pay you 10 dollars, and if you get it wrong you pay me 1 dollar. then you ask me a question, with the same conditions." blonde says, "no thanks, I'm reading a book." the lawyer says, "okay how about this, 20 dollars for getting right for you, and 20 dollars for getting wrong for me." the blonde rolls her eyes and says fine. the lawyer asks, "whats the distance from the earth to the sun?" the blonde hands him a dollar. then the blonde asks him, "what goes uphill with 3 legs and down hill with 4?" the lawyer blinks for a second and says " i have no idea, i guess you win that round." then hands her 20. "okay my turn again, i am curious, what does go up hill with three legs and down hill with 4?" the blonde hands him another dollar.

i belive this site has been posted once before, never the less, i found it to be quite fun. http://tonematrix.audiotool.com/_/10g.840.g40.10g.9.1400.i0.6.o00.i0.0.1409.210.82.84.210 click on the grid and press space to clear all. the above represents a no-three-in-a-line solution to a 16x16 grid. http://tonematrix.audiotool.com/_/10.100.1000.400.20.2.800.1.40.8.g00.g0.800.80.4.g and here's a solution to the n-queens problem.