This is a real story. A long long time ago, based on the "Four fours" problem, I wondered if I could do the same using exactly five 3īs, the restrictions a bit tighter: I could use only the 4 basic math operations, exponentiation, factorial, and all parentheses I may need. Besides, I didnīt disallow me to join two "3īs" to make "33".

Using this, and only this, I succeeded in writing expressions for all integers from 0 to 100.

To narrow your work, since a great number of integers can be easily obtained, can you find expressions for 47, 50, 56, 58, 64, 70, 71, 73, 74, 76, 77, 85, 88, 94, and 95?

(In reply to Values from one "3" by Leming)

3!! = 3 -- not 120; (3!)! = 120

I was under the impression only the factorial, not the double factorial, was permitted.  But if other factorials were permitted, we have the following with one 3 at our disposal:

!3 = GAMMA(3) = 2
(3!)!! = 48
GAMMA(3!) = 120
!(3!) = 265

 

Posted by Dej Mar on 2008-07-07 20:21:06