(base) Desktop$ swipl
Welcome to SWI-Prolog (threaded, 64 bits, version 8.2.4)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit https://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).

?- [fibonacci].
true.

?- f(5,X).
X = 5 ;
false.

?- f(6,X).
X = 8 ;
false.

?- f(7,X).
X = 13 .

?- f(1000,X).

?- f(1000,X).
ERROR: Stack limit (1.0Gb) exceeded
ERROR:   Stack sizes: local: 0.9Gb, global: 79.8Mb, trail: 53.2Mb
ERROR:   Stack depth: 1,000, last-call: 0%, Choice points: 3,485,432
ERROR:   Possible non-terminating recursion:
ERROR:     [1,000] user:f(0, _20924990)
ERROR:     [999] user:f(2, _20925010)
?- f(100,X).
ERROR: Stack limit (1.0Gb) exceeded
ERROR:   Stack sizes: local: 0.9Gb, global: 79.8Mb, trail: 53.2Mb
ERROR:   Stack depth: 101, last-call: 1%, Choice points: 3,485,301
ERROR:   In:
ERROR:     [101] user:f(0, _20912648)
ERROR:     [100] user:f(2, _20912668)
ERROR:     [99] user:f(3, _20912688)
ERROR:     [98] user:f(4, _20912708)
ERROR:     [97] user:f(5, _20912728)
ERROR: 
ERROR: Use the --stack_limit=size[KMG] command line option or
ERROR: ?- set_prolog_flag(stack_limit, 2_147_483_648). to double the limit.
?- f(20,X).









?- f(20,X).
X = 6765 ;
false.

?- f(30,X).
X = 832040 ;
false.

?- f(40,X).
ERROR: Stack limit (1.0Gb) exceeded
ERROR:   Stack sizes: local: 0.9Gb, global: 79.6Mb, trail: 53.1Mb
ERROR:   Stack depth: 39, last-call: 3%, Choice points: 3,485,608
ERROR:   In:
ERROR:     [39] user:f(2, _20864062)
ERROR:     [38] user:f(3, _20864082)
ERROR:     [37] user:f(5, _20864102)
ERROR:     [36] user:f(7, _20864122)
ERROR:     [35] user:f(8, _20864142)
ERROR: 
ERROR: Use the --stack_limit=size[KMG] command line option or
ERROR: ?- set_prolog_flag(stack_limit, 2_147_483_648). to double the limit.
?-