/prog/ challenge redux

Create a LISP program that generates random LISP programs.

No two runs of the program should generate the same code.

Generated code must be VALID LISP and should (given random input) return a value without throwing errors in such a way that the same input always returns the same output.

>>3
It's impossible because generating an infinite stream of unique random numbers is impossible.  I'm sure OP meant to say that each unique seed should generate a unique program.