A364934 - cp's OEIS frontend

A364934 a(n+1) = 1 + number of previous terms that share a factor > 1 with a(n); a(1) = 2.

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

[2, 2, 3, 2, 4, 5, 2, 6, 8, 8, 9, 4, 10, 12, 14, 13, 2, 14, 15, 8, 16, 17, 2, 18, 22, 20, 23, 2, 22, 23, 3, 8, 24, 29, 2, 26, 28, 28, 29, 3, 10, 32, 31, 2, 32, 33, 13, 4, 34, 36, 42, 43, 2, 38, 39, 17, 4, 40, 43, 3, 15, 21, 21, 22, 43, 4, 43, 5, 9, 19, 3, 20, 48, 58, 48, 60, 63, 28, 52, 53, 2, 51, 28]

cp's OEIS Frontend

A364934 a(n+1) = 1 + number of previous terms that share a factor > 1 with a(n); a(1) = 2.

Table of values

List of values

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

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

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