4
This number is a composite.
Just showing those entries submitted by 'Poo Sung': (Click here to show all)
In the movie "Die Hard with a Vengeance", Bruce Willis must measure 4 litres of water using two containers one with a capacity of 3 litres and the other with 5 litres. This problem can be solved by the Euclidean algorithm since 3 and 5 are mutually prime. [Poo Sung]
1!1 +2!2 + 3!3 + 4!4 is prime. [Poo Sung]
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