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IBM does have several methods of doing this in RPGLE.
One is api CEERAN0, bit I'd prefer the next one:
IBM doc Generating Random Numbers using API Qc3GenPRNs (which includes ILE code)
http://www-912.ibm.com/s_dir/SLKBase.nsf/1ac66549a21402188625680b0002037e/00599805bfa9117f86256c48005989f6?OpenDocument
 
I don't know if this prev mentioned, but random does not mean unique!. Just like the lottery, numbers can repeat - and you need your own logic to handle that.
In Insurance reporting to regulatory agencies, we sometime have to provide a random sample using a documented and approved method.
Jim Franz
 

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