A352968 - cp's OEIS frontend

A352968 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number that has not appeared that shares a factor with min(a(n-2),a(n-1)).

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	5
11	15
12	20
13	18
14	14
15	7
16	21
17	28
18	24
19	16
20	22
21	26
22	11
23	33
24	44
25	27
26	30
27	36
28	25
29	35
30	40
31	42
32	32
33	34
34	38
35	17
36	51
37	68
38	39
39	13
40	52
41	65
42	46
43	23
44	69
45	92
46	45
47	48
48	50
49	54
50	55
51	56
52	60
53	49
54	63
55	70
56	57
57	19
58	76
59	95
60	58
61	29
62	87
63	116
64	66
65	62
66	31
67	93
68	124
69	72
70	64
71	74
72	78
73	37
74	111
75	148
76	75

[1, 2, 3, 4, 6, 8, 9, 10, 12, 5, 15, 20, 18, 14, 7, 21, 28, 24, 16, 22, 26, 11, 33, 44, 27, 30, 36, 25, 35, 40, 42, 32, 34, 38, 17, 51, 68, 39, 13, 52, 65, 46, 23, 69, 92, 45, 48, 50, 54, 55, 56, 60, 49, 63, 70, 57, 19, 76, 95, 58, 29, 87, 116, 66, 62, 31, 93, 124, 72, 64, 74, 78, 37, 111, 148, 75]

cp's OEIS Frontend

A352968 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number that has not appeared that shares a factor with min(a(n-2),a(n-1)).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	5
11	15
12	20
13	18
14	14
15	7
16	21
17	28
18	24
19	16
20	22
21	26
22	11
23	33
24	44
25	27
26	30
27	36
28	25
29	35
30	40
31	42
32	32
33	34
34	38
35	17
36	51
37	68
38	39
39	13
40	52
41	65
42	46
43	23
44	69
45	92
46	45
47	48
48	50
49	54
50	55
51	56
52	60
53	49
54	63
55	70
56	57
57	19
58	76
59	95
60	58
61	29
62	87
63	116
64	66
65	62
66	31
67	93
68	124
69	72
70	64
71	74
72	78
73	37
74	111
75	148
76	75

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	5
11	15
12	20
13	18
14	14
15	7
16	21
17	28
18	24
19	16
20	22
21	26
22	11
23	33
24	44
25	27
26	30
27	36
28	25
29	35
30	40
31	42
32	32
33	34
34	38
35	17
36	51
37	68
38	39
39	13
40	52
41	65
42	46
43	23
44	69
45	92
46	45
47	48
48	50
49	54
50	55
51	56
52	60
53	49
54	63
55	70
56	57
57	19
58	76
59	95
60	58
61	29
62	87
63	116
64	66
65	62
66	31
67	93
68	124
69	72
70	64
71	74
72	78
73	37
74	111
75	148
76	75

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	5
11	15
12	20
13	18
14	14
15	7
16	21
17	28
18	24
19	16
20	22
21	26
22	11
23	33
24	44
25	27
26	30
27	36
28	25
29	35
30	40
31	42
32	32
33	34
34	38
35	17
36	51
37	68
38	39
39	13
40	52
41	65
42	46
43	23
44	69
45	92
46	45
47	48
48	50
49	54
50	55
51	56
52	60
53	49
54	63
55	70
56	57
57	19
58	76
59	95
60	58
61	29
62	87
63	116
64	66
65	62
66	31
67	93
68	124
69	72
70	64
71	74
72	78
73	37
74	111
75	148
76	75