M, dylnanM, dylnan
ÆPø“;;“»VOḣ2S⁵++3Ọ;”Pv
This probably wasn't the intended solution.
How it works
ÆP
is the built-in primality test.
ø
beings a new, niladic chain. Since the previous return value (the result of ÆP
) goes out of scope, this prints it implicitly.
“;;“»
evaluates to the list of strings ["< Aalst" ""]
, and V
tries to eval them. s
tries to split its argument into chunks of length 0, which causes the M interpreter to crash, suppressing further output.