10 N$ = "0"

100 O$ = N$
110 PRINT O$
120 N$ = ""
130 C = 1
140 FOR I = LEN(O$) TO 1 STEP -1
150     N = VAL(MID$(O$, I, 1)) + C
160     C = N >= 8
170     N$ = STR$(N - C * 8) + N$
180 NEXT I
190 IF C THEN N$ = "1" + N$
200 GOTO 100