There is a way to express 64 with only two fours and no symbols beyond +, -, *, /, ^, √, !, and parenthesis, although some may be used more than once. It isn't too hard. Can you find it?

It is asserted in a reliable source that 64 can also be expressed with a single 4 using 57 square root signs, nine factorials (no double or higher factorials), and 18 sets of parentheses. I can't figure it out. Can you?

(In reply to Second Part by Demau Senae)

How did you get this?

I tried to evaluate it but overflowed the calculator at the fifth factorial.

Posted by Jer on 2006-04-11 12:26:36