%!PS

% Warning, this is untested - it runs off the end of Ghostscript's ability
% to handle memory allocation happily.

/bubblesort {
    mark exch aload pop counttomark /idx
    exch store
    {
        0 1 idx 1 sub {
            pop 2 copy gt {
                exch
            } if idx 1 roll
        } for
        idx 1 roll /idx idx 1 sub store
        idx 0 eq {
            exit
        } if
    } loop
]
} store

/apush { % [a b] c -> [a b c]
    /t exch def
    [ exch aload pop t ]
} bind def

/genprimes {
    /mx exch def
    /primesh mx dict def
    2 1 3 {
        primesh exch 1 put
    } for
    6 6 mx {
        dup 1 sub exch 1 add 2 exch {
            primesh exch 1 put
        } for
    } for
    /q [ 3 5 7 ] def
    /qi 0 def
    /p 2 def
    /mr mx sqrt cvi def
    {
        p mr le not {
            exit
        } if
        primesh p known {
            p dup mul p mx {
                primesh exch undef
            } for
        } if
        q length qi sub 2 le {
            /q q q q length 1 sub get 4 add apush def
            /q q q q length 1 sub get 2 add apush def
        } if
        /p q qi get def
        /qi qi 1 add def
    } loop
    /primes 0 array def
    primesh {
        pop
        /primes exch primes exch apush def
    } forall
    primes bubblesort
} bind def

/nthprime {
    /n exch def
    /m 15 def
    n 6 ge {
        /m n ln n mul ln n mul 1 add cvi def
    } if
    /pr m genprimes def
    pr n 1 sub get
} bind def

10001 nthprime 104743 eq { (Pass) } { (FAIL) } ifelse =