Calc Crash (Real and Virtual)

[Arno K]

Well, I don't think that the calculators crashes (or I stopped that too early well, after about 10 minutes), perhaps you will have a look at the table here., which says that the deeply recursive ackerman-function should provide a(4,3)=a(3, 2^65536-3) which is bigger than the estimated amount of atoms in universe. So it should provide an overflow error at some point.
Arno