New to Java

Hi

I want to put 3 variables into an array like [1][2][3]
but there are over 40,000 of these, varies every time.
I want my array to look like [1][2][3]
[2][3][4]
[5][5][6]
all the ways down

I am declaring it as int [][][] numArray= new int[40000][40000][40000]
Is this right because when I compile it I get an out of memory exception

Thanks