(15C) Fibonacci Numbers

[Werner]

Yes, I realized that too. The program now becomes (with 15C instructions only, I think - UPS is late):
(Update: now correct up to n=47. N=48 is off by 1, and N=49 is correct, too)

29 Bytes:

Code:

01 LBL"FIB"
02 .2
03 ENTER
04 SQRT
05 ENTER
06 RDN
07 +
08 X<>Y
09 Y^X
10 .4
11 LASTX
12 Y^X
13 /
14 *
15 ENTER
16 FRC
17 +
18 INT
19 END

Cheers, Werner