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[ February 25, 2007 ]
A ninedigital enigma
Michael Bergman (email)

Michael Bergman remembers an old question but
he can't seem to remember the answer !
The question is as follows :

Use the digit '2' only three times to make 1 2 3 4 5 6 7 8 9
Do you have any idea what the answer would be ?

A friend of Michael got the question from his math teacher, but it's
too hard to figure out. The actual answer is pretty long to write out,
but here's a demonstration of how to get it :

Try these on the calculator (you can see the image hereunder).
See a pattern ? To get it to equal 1 2 3 4 5 6 7 8 9,
just stack that many square roots on top of the first 2.


A000170 Prime Curios! Prime Puzzle
Wikipedia 170 Le nombre 170

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