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Undefined until you tell us
In theory the next number can be anything, without having a clearly defined function it’s impossible to precisely predict which number could come up in series.
For the less theoretical approach the value for 6 would be 36, which could the imply the function f: x -> x^2
Now, am I too bold to guess a 36?
OK, I’ll bite…
The function is only defined for the domain values for which you have specified a result. Outside this domain, the result is undefined – strictly a precondition failure, as this is a partial function.
Am I warm? :-)
You can guess anything. My guess is square root of -3. It’s as valid as your guess, since the true answer is whatever function professor Meyer has in mind.
I guess since the question is what is the value for 6, then we can rule out a precondition violation.
my guess is that the function is y = x * x % 4294967296