A374481 - cp's OEIS frontend

A374481 The distance from prime(n) to the nearest common ancestor of prime(n) and 1+prime(n) in the Doudna-tree (A005940).

n	a(n)
1	0
2	1
3	1
4	3
5	3
6	2
7	6
8	5
9	7
10	8
11	10
12	4
13	10
14	9
15	13
16	15
17	15
18	7
19	12
20	19
21	9
22	19
23	20
24	22
25	24
26	20
27	21
28	27
29	26
30	23
31	30
32	28
33	25
34	32
35	34
36	28
37	15
38	25
39	36
40	31
41	39
42	39
43	41
44	19
45	41
46	45
47	31
48	44
49	42
50	43
51	46
52	50
53	52
54	51
55	42
56	52
57	55
58	51
59	25
60	46
61	41
62	61
63	61
64	59
65	28
66	51
67	44
68	67
69	60
70	68
71	55
72	70
73	64
74	71
75	69
76	74
77	73
78	32
79	61
80	69
81	79
82	35
83	82

[0, 1, 1, 3, 3, 2, 6, 5, 7, 8, 10, 4, 10, 9, 13, 15, 15, 7, 12, 19, 9, 19, 20, 22, 24, 20, 21, 27, 26, 23, 30, 28, 25, 32, 34, 28, 15, 25, 36, 31, 39, 39, 41, 19, 41, 45, 31, 44, 42, 43, 46, 50, 52, 51, 42, 52, 55, 51, 25, 46, 41, 61, 61, 59, 28, 51, 44, 67, 60, 68, 55, 70, 64, 71, 69, 74, 73, 32, 61, 69, 79, 35, 82]

cp's OEIS Frontend

A374481 The distance from prime(n) to the nearest common ancestor of prime(n) and 1+prime(n) in the Doudna-tree (A005940).

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	3
5	3
6	2
7	6
8	5
9	7
10	8
11	10
12	4
13	10
14	9
15	13
16	15
17	15
18	7
19	12
20	19
21	9
22	19
23	20
24	22
25	24
26	20
27	21
28	27
29	26
30	23
31	30
32	28
33	25
34	32
35	34
36	28
37	15
38	25
39	36
40	31
41	39
42	39
43	41
44	19
45	41
46	45
47	31
48	44
49	42
50	43
51	46
52	50
53	52
54	51
55	42
56	52
57	55
58	51
59	25
60	46
61	41
62	61
63	61
64	59
65	28
66	51
67	44
68	67
69	60
70	68
71	55
72	70
73	64
74	71
75	69
76	74
77	73
78	32
79	61
80	69
81	79
82	35
83	82

n	a(n)
1	0
2	1
3	1
4	3
5	3
6	2
7	6
8	5
9	7
10	8
11	10
12	4
13	10
14	9
15	13
16	15
17	15
18	7
19	12
20	19
21	9
22	19
23	20
24	22
25	24
26	20
27	21
28	27
29	26
30	23
31	30
32	28
33	25
34	32
35	34
36	28
37	15
38	25
39	36
40	31
41	39
42	39
43	41
44	19
45	41
46	45
47	31
48	44
49	42
50	43
51	46
52	50
53	52
54	51
55	42
56	52
57	55
58	51
59	25
60	46
61	41
62	61
63	61
64	59
65	28
66	51
67	44
68	67
69	60
70	68
71	55
72	70
73	64
74	71
75	69
76	74
77	73
78	32
79	61
80	69
81	79
82	35
83	82

n	a(n)
1	0
2	1
3	1
4	3
5	3
6	2
7	6
8	5
9	7
10	8
11	10
12	4
13	10
14	9
15	13
16	15
17	15
18	7
19	12
20	19
21	9
22	19
23	20
24	22
25	24
26	20
27	21
28	27
29	26
30	23
31	30
32	28
33	25
34	32
35	34
36	28
37	15
38	25
39	36
40	31
41	39
42	39
43	41
44	19
45	41
46	45
47	31
48	44
49	42
50	43
51	46
52	50
53	52
54	51
55	42
56	52
57	55
58	51
59	25
60	46
61	41
62	61
63	61
64	59
65	28
66	51
67	44
68	67
69	60
70	68
71	55
72	70
73	64
74	71
75	69
76	74
77	73
78	32
79	61
80	69
81	79
82	35
83	82