A378116 - cp's OEIS frontend

A378116 Lexicographically earliest sequence of distinct positive integers such that a(a(n)) shares a factor with a(a(n)-2) while not sharing a factor with a(a(n)-1).

n	a(n)
1	3
2	4
3	9
4	8
5	7
6	6
7	35
8	12
9	25
10	11
11	15
12	22
13	14
14	33
15	16
16	21
17	18
18	49
19	20
20	63
21	26
22	27
23	19
24	24
25	95
26	28
27	45
28	32
29	31
30	30
31	217
32	34
33	77
34	36
35	55
36	38
37	39
38	40
39	51
40	44
41	42
42	121
43	46
44	99
45	50
46	57
47	43
48	48
49	215
50	52
51	75
52	56
53	54
54	91
55	58
56	65
57	62
58	85
59	60
60	119
61	64
62	105
63	68
64	69
65	70
66	61
67	71
68	122
69	213
70	74
71	81
72	73
73	78
74	365
75	76
76	115
77	82
78	125
79	83
80	80
81	249
82	86
83	87
84	88
85	93
86	92
87	111
88	94
89	84

[3, 4, 9, 8, 7, 6, 35, 12, 25, 11, 15, 22, 14, 33, 16, 21, 18, 49, 20, 63, 26, 27, 19, 24, 95, 28, 45, 32, 31, 30, 217, 34, 77, 36, 55, 38, 39, 40, 51, 44, 42, 121, 46, 99, 50, 57, 43, 48, 215, 52, 75, 56, 54, 91, 58, 65, 62, 85, 60, 119, 64, 105, 68, 69, 70, 61, 71, 122, 213, 74, 81, 73, 78, 365, 76, 115, 82, 125, 83, 80, 249, 86, 87, 88, 93, 92, 111, 94, 84]

cp's OEIS Frontend

A378116 Lexicographically earliest sequence of distinct positive integers such that a(a(n)) shares a factor with a(a(n)-2) while not sharing a factor with a(a(n)-1).

Table of values

List of values

n	a(n)
1	3
2	4
3	9
4	8
5	7
6	6
7	35
8	12
9	25
10	11
11	15
12	22
13	14
14	33
15	16
16	21
17	18
18	49
19	20
20	63
21	26
22	27
23	19
24	24
25	95
26	28
27	45
28	32
29	31
30	30
31	217
32	34
33	77
34	36
35	55
36	38
37	39
38	40
39	51
40	44
41	42
42	121
43	46
44	99
45	50
46	57
47	43
48	48
49	215
50	52
51	75
52	56
53	54
54	91
55	58
56	65
57	62
58	85
59	60
60	119
61	64
62	105
63	68
64	69
65	70
66	61
67	71
68	122
69	213
70	74
71	81
72	73
73	78
74	365
75	76
76	115
77	82
78	125
79	83
80	80
81	249
82	86
83	87
84	88
85	93
86	92
87	111
88	94
89	84

n	a(n)
1	3
2	4
3	9
4	8
5	7
6	6
7	35
8	12
9	25
10	11
11	15
12	22
13	14
14	33
15	16
16	21
17	18
18	49
19	20
20	63
21	26
22	27
23	19
24	24
25	95
26	28
27	45
28	32
29	31
30	30
31	217
32	34
33	77
34	36
35	55
36	38
37	39
38	40
39	51
40	44
41	42
42	121
43	46
44	99
45	50
46	57
47	43
48	48
49	215
50	52
51	75
52	56
53	54
54	91
55	58
56	65
57	62
58	85
59	60
60	119
61	64
62	105
63	68
64	69
65	70
66	61
67	71
68	122
69	213
70	74
71	81
72	73
73	78
74	365
75	76
76	115
77	82
78	125
79	83
80	80
81	249
82	86
83	87
84	88
85	93
86	92
87	111
88	94
89	84

n	a(n)
1	3
2	4
3	9
4	8
5	7
6	6
7	35
8	12
9	25
10	11
11	15
12	22
13	14
14	33
15	16
16	21
17	18
18	49
19	20
20	63
21	26
22	27
23	19
24	24
25	95
26	28
27	45
28	32
29	31
30	30
31	217
32	34
33	77
34	36
35	55
36	38
37	39
38	40
39	51
40	44
41	42
42	121
43	46
44	99
45	50
46	57
47	43
48	48
49	215
50	52
51	75
52	56
53	54
54	91
55	58
56	65
57	62
58	85
59	60
60	119
61	64
62	105
63	68
64	69
65	70
66	61
67	71
68	122
69	213
70	74
71	81
72	73
73	78
74	365
75	76
76	115
77	82
78	125
79	83
80	80
81	249
82	86
83	87
84	88
85	93
86	92
87	111
88	94
89	84