A193615 - cp's OEIS frontend

A193615 Second-largest prime factor of the n-th Fibonacci number, if composite, or 1 otherwise.

n	a(n)
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	5
11	1
12	3
13	1
14	13
15	5
16	7
17	1
18	17
19	37
20	11
21	13
22	89
23	1
24	7
25	5
26	233
27	53
28	29
29	1
30	31
31	557
32	47
33	89
34	1597
35	13
36	19
37	149
38	113
39	233
40	41
41	2789
42	211
43	1
44	199
45	61
46	461
47	1
48	47
49	97
50	151
51	1597
52	521
53	953
54	109
55	661
56	281
57	797
58	19489
59	353
60	61
61	4513

[1, 1, 1, 2, 1, 3, 2, 5, 1, 3, 1, 13, 5, 7, 1, 17, 37, 11, 13, 89, 1, 7, 5, 233, 53, 29, 1, 31, 557, 47, 89, 1597, 13, 19, 149, 113, 233, 41, 2789, 211, 1, 199, 61, 461, 1, 47, 97, 151, 1597, 521, 953, 109, 661, 281, 797, 19489, 353, 61, 4513]

cp's OEIS Frontend

A193615 Second-largest prime factor of the n-th Fibonacci number, if composite, or 1 otherwise.

Table of values

List of values