A260228 - cp's OEIS frontend

A260228 a(n) = max(gcd(n,F(n-1)),gcd(n,F(n+1))), where F(n) is the n-th Fibonacci number.

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

[1, 2, 3, 2, 1, 1, 7, 2, 3, 2, 11, 1, 13, 2, 3, 2, 17, 1, 19, 2, 3, 2, 23, 1, 1, 2, 3, 2, 29, 1, 31, 2, 3, 2, 1, 1, 37, 2, 3, 2, 41, 1, 43, 2, 3, 2, 47, 1, 7, 2, 3, 2, 53, 1, 1, 2, 3, 2, 59, 1, 61, 2, 21, 2, 1, 1, 67, 2, 3, 2, 71, 1, 73, 2, 3, 2, 1, 13, 79, 2, 3, 2, 83, 1, 1, 2, 3, 2, 89, 1, 1, 2, 3, 2, 1, 1, 97, 2, 33, 2]

cp's OEIS Frontend

A260228 a(n) = max(gcd(n,F(n-1)),gcd(n,F(n+1))), where F(n) is the n-th Fibonacci number.

Table of values

List of values

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

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

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