10 PRINT "NUMBER","LARGEST FACTOR"
20 FOR N = 1001 TO 1020 STEP 2
30    PRINT N,
40    FOR F = INT(N/2) TO 1 STEP -1
50       IF N/F <> INT(N/F) THEN 80
60       PRINT F
70       GOTO 90
80    NEXT F
90 NEXT N
99 END
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