A001578 - cp's OEIS frontend

A001578 Smallest primitive prime factor of Fibonacci number F(n), or 1 if F(n) has no primitive prime factor.

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	1
7	13
8	7
9	17
10	11
11	89
12	1
13	233
14	29
15	61
16	47
17	1597
18	19
19	37
20	41
21	421
22	199
23	28657
24	23
25	3001
26	521
27	53
28	281
29	514229
30	31
31	557
32	2207
33	19801
34	3571
35	141961
36	107
37	73
38	9349
39	135721
40	2161
41	2789
42	211
43	433494437
44	43
45	109441
46	139
47	2971215073
48	1103
49	97
50	101

[1, 1, 2, 3, 5, 1, 13, 7, 17, 11, 89, 1, 233, 29, 61, 47, 1597, 19, 37, 41, 421, 199, 28657, 23, 3001, 521, 53, 281, 514229, 31, 557, 2207, 19801, 3571, 141961, 107, 73, 9349, 135721, 2161, 2789, 211, 433494437, 43, 109441, 139, 2971215073, 1103, 97, 101]

cp's OEIS Frontend

A001578 Smallest primitive prime factor of Fibonacci number F(n), or 1 if F(n) has no primitive prime factor.

Table of values

List of values