A105307 - cp's OEIS frontend

A105307 Base-2 logarithm of the number of divisors of Fibonacci(n) if that number is a power of 2, otherwise -1.

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	-1
13	1
14	2
15	3
16	3
17	1
18	4
19	2
20	4
21	3
22	2
23	1
24	-1
25	-1
26	2
27	4
28	4
29	1
30	6
31	2
32	4
33	3
34	2
35	3
36	-1
37	3
38	3
39	3
40	6
41	2
42	6
43	1
44	5
45	5
46	3
47	1
48	-1
49	3
50	-1
51	3
52	4
53	2
54	7
55	4
56	-1
57	5
58	3
59	2
60	-1
61	2
62	3
63	5
64	6
65	3
66	6
67	3
68	5
69	5
70	7
71	2
72	-1
73	2
74	4
75	-1
76	5
77	4
78	7
79	2
80	9
81	7
82	3
83	1
84	-1
85	4
86	3
87	4
88	9
89	2
90	11
91	-1
92	6
93	4
94	2
95	6
96	-1
97	4
98	5
99	6
100	-1
101	2
102	7
103	3
104	7
105	7
106	3
107	2
108	-1
109	2
110	-1
111	5
112	-1
113	2
114	9
115	4
116	6
117	6
118	5
119	3

[0, 0, 1, 1, 1, 2, 1, 2, 2, 2, 1, -1, 1, 2, 3, 3, 1, 4, 2, 4, 3, 2, 1, -1, -1, 2, 4, 4, 1, 6, 2, 4, 3, 2, 3, -1, 3, 3, 3, 6, 2, 6, 1, 5, 5, 3, 1, -1, 3, -1, 3, 4, 2, 7, 4, -1, 5, 3, 2, -1, 2, 3, 5, 6, 3, 6, 3, 5, 5, 7, 2, -1, 2, 4, -1, 5, 4, 7, 2, 9, 7, 3, 1, -1, 4, 3, 4, 9, 2, 11, -1, 6, 4, 2, 6, -1, 4, 5, 6, -1, 2, 7, 3, 7, 7, 3, 2, -1, 2, -1, 5, -1, 2, 9, 4, 6, 6, 5, 3]

cp's OEIS Frontend

A105307 Base-2 logarithm of the number of divisors of Fibonacci(n) if that number is a power of 2, otherwise -1.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	-1
13	1
14	2
15	3
16	3
17	1
18	4
19	2
20	4
21	3
22	2
23	1
24	-1
25	-1
26	2
27	4
28	4
29	1
30	6
31	2
32	4
33	3
34	2
35	3
36	-1
37	3
38	3
39	3
40	6
41	2
42	6
43	1
44	5
45	5
46	3
47	1
48	-1
49	3
50	-1
51	3
52	4
53	2
54	7
55	4
56	-1
57	5
58	3
59	2
60	-1
61	2
62	3
63	5
64	6
65	3
66	6
67	3
68	5
69	5
70	7
71	2
72	-1
73	2
74	4
75	-1
76	5
77	4
78	7
79	2
80	9
81	7
82	3
83	1
84	-1
85	4
86	3
87	4
88	9
89	2
90	11
91	-1
92	6
93	4
94	2
95	6
96	-1
97	4
98	5
99	6
100	-1
101	2
102	7
103	3
104	7
105	7
106	3
107	2
108	-1
109	2
110	-1
111	5
112	-1
113	2
114	9
115	4
116	6
117	6
118	5
119	3

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	-1
13	1
14	2
15	3
16	3
17	1
18	4
19	2
20	4
21	3
22	2
23	1
24	-1
25	-1
26	2
27	4
28	4
29	1
30	6
31	2
32	4
33	3
34	2
35	3
36	-1
37	3
38	3
39	3
40	6
41	2
42	6
43	1
44	5
45	5
46	3
47	1
48	-1
49	3
50	-1
51	3
52	4
53	2
54	7
55	4
56	-1
57	5
58	3
59	2
60	-1
61	2
62	3
63	5
64	6
65	3
66	6
67	3
68	5
69	5
70	7
71	2
72	-1
73	2
74	4
75	-1
76	5
77	4
78	7
79	2
80	9
81	7
82	3
83	1
84	-1
85	4
86	3
87	4
88	9
89	2
90	11
91	-1
92	6
93	4
94	2
95	6
96	-1
97	4
98	5
99	6
100	-1
101	2
102	7
103	3
104	7
105	7
106	3
107	2
108	-1
109	2
110	-1
111	5
112	-1
113	2
114	9
115	4
116	6
117	6
118	5
119	3

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	-1
13	1
14	2
15	3
16	3
17	1
18	4
19	2
20	4
21	3
22	2
23	1
24	-1
25	-1
26	2
27	4
28	4
29	1
30	6
31	2
32	4
33	3
34	2
35	3
36	-1
37	3
38	3
39	3
40	6
41	2
42	6
43	1
44	5
45	5
46	3
47	1
48	-1
49	3
50	-1
51	3
52	4
53	2
54	7
55	4
56	-1
57	5
58	3
59	2
60	-1
61	2
62	3
63	5
64	6
65	3
66	6
67	3
68	5
69	5
70	7
71	2
72	-1
73	2
74	4
75	-1
76	5
77	4
78	7
79	2
80	9
81	7
82	3
83	1
84	-1
85	4
86	3
87	4
88	9
89	2
90	11
91	-1
92	6
93	4
94	2
95	6
96	-1
97	4
98	5
99	6
100	-1
101	2
102	7
103	3
104	7
105	7
106	3
107	2
108	-1
109	2
110	-1
111	5
112	-1
113	2
114	9
115	4
116	6
117	6
118	5
119	3