A262904 - cp's OEIS frontend

A262904 If n = A259934(k) then a(n) = k, otherwise largest k such that A259934(k) is an ancestor of n in a tree generated by edge-relation A049820(child) = parent.

n	a(n)
0	0
1	0
2	1
3	0
4	0
5	0
6	2
7	0
8	0
9	2
10	2
11	2
12	3
13	2
14	2
15	2
16	2
17	2
18	4
19	2
20	2
21	2
22	5
23	2
24	2
25	5
26	5
27	2
28	5
29	2
30	6
31	2
32	5
33	2
34	7
35	2
36	2
37	2
38	7
39	2
40	5
41	2
42	8
43	2
44	7
45	2
46	9
47	2
48	7
49	9
50	7
51	2
52	9
53	2
54	10
55	2
56	7
57	2
58	11
59	2
60	7
61	2
62	12
63	2
64	2
65	2
66	11
67	2
68	12
69	2
70	13
71	2
72	7
73	2
74	13
75	2
76	13
77	2
78	14
79	2
80	13
81	13
82	14
83	13
84	7
85	13
86	14
87	13
88	13
89	13
90	15
91	13
92	14
93	13
94	16
95	13
96	7
97	13
98	14
99	13
100	13
101	13
102	17
103	13
104	7
105	13
106	18
107	13
108	7
109	13
110	17
111	13
112	17
113	13
114	19
115	13
116	17
117	13
118	20
119	13
120	7
121	21

[0, 0, 1, 0, 0, 0, 2, 0, 0, 2, 2, 2, 3, 2, 2, 2, 2, 2, 4, 2, 2, 2, 5, 2, 2, 5, 5, 2, 5, 2, 6, 2, 5, 2, 7, 2, 2, 2, 7, 2, 5, 2, 8, 2, 7, 2, 9, 2, 7, 9, 7, 2, 9, 2, 10, 2, 7, 2, 11, 2, 7, 2, 12, 2, 2, 2, 11, 2, 12, 2, 13, 2, 7, 2, 13, 2, 13, 2, 14, 2, 13, 13, 14, 13, 7, 13, 14, 13, 13, 13, 15, 13, 14, 13, 16, 13, 7, 13, 14, 13, 13, 13, 17, 13, 7, 13, 18, 13, 7, 13, 17, 13, 17, 13, 19, 13, 17, 13, 20, 13, 7, 21]

cp's OEIS Frontend

A262904 If n = A259934(k) then a(n) = k, otherwise largest k such that A259934(k) is an ancestor of n in a tree generated by edge-relation A049820(child) = parent.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	0
5	0
6	2
7	0
8	0
9	2
10	2
11	2
12	3
13	2
14	2
15	2
16	2
17	2
18	4
19	2
20	2
21	2
22	5
23	2
24	2
25	5
26	5
27	2
28	5
29	2
30	6
31	2
32	5
33	2
34	7
35	2
36	2
37	2
38	7
39	2
40	5
41	2
42	8
43	2
44	7
45	2
46	9
47	2
48	7
49	9
50	7
51	2
52	9
53	2
54	10
55	2
56	7
57	2
58	11
59	2
60	7
61	2
62	12
63	2
64	2
65	2
66	11
67	2
68	12
69	2
70	13
71	2
72	7
73	2
74	13
75	2
76	13
77	2
78	14
79	2
80	13
81	13
82	14
83	13
84	7
85	13
86	14
87	13
88	13
89	13
90	15
91	13
92	14
93	13
94	16
95	13
96	7
97	13
98	14
99	13
100	13
101	13
102	17
103	13
104	7
105	13
106	18
107	13
108	7
109	13
110	17
111	13
112	17
113	13
114	19
115	13
116	17
117	13
118	20
119	13
120	7
121	21

n	a(n)
0	0
1	0
2	1
3	0
4	0
5	0
6	2
7	0
8	0
9	2
10	2
11	2
12	3
13	2
14	2
15	2
16	2
17	2
18	4
19	2
20	2
21	2
22	5
23	2
24	2
25	5
26	5
27	2
28	5
29	2
30	6
31	2
32	5
33	2
34	7
35	2
36	2
37	2
38	7
39	2
40	5
41	2
42	8
43	2
44	7
45	2
46	9
47	2
48	7
49	9
50	7
51	2
52	9
53	2
54	10
55	2
56	7
57	2
58	11
59	2
60	7
61	2
62	12
63	2
64	2
65	2
66	11
67	2
68	12
69	2
70	13
71	2
72	7
73	2
74	13
75	2
76	13
77	2
78	14
79	2
80	13
81	13
82	14
83	13
84	7
85	13
86	14
87	13
88	13
89	13
90	15
91	13
92	14
93	13
94	16
95	13
96	7
97	13
98	14
99	13
100	13
101	13
102	17
103	13
104	7
105	13
106	18
107	13
108	7
109	13
110	17
111	13
112	17
113	13
114	19
115	13
116	17
117	13
118	20
119	13
120	7
121	21

n	a(n)
0	0
1	0
2	1
3	0
4	0
5	0
6	2
7	0
8	0
9	2
10	2
11	2
12	3
13	2
14	2
15	2
16	2
17	2
18	4
19	2
20	2
21	2
22	5
23	2
24	2
25	5
26	5
27	2
28	5
29	2
30	6
31	2
32	5
33	2
34	7
35	2
36	2
37	2
38	7
39	2
40	5
41	2
42	8
43	2
44	7
45	2
46	9
47	2
48	7
49	9
50	7
51	2
52	9
53	2
54	10
55	2
56	7
57	2
58	11
59	2
60	7
61	2
62	12
63	2
64	2
65	2
66	11
67	2
68	12
69	2
70	13
71	2
72	7
73	2
74	13
75	2
76	13
77	2
78	14
79	2
80	13
81	13
82	14
83	13
84	7
85	13
86	14
87	13
88	13
89	13
90	15
91	13
92	14
93	13
94	16
95	13
96	7
97	13
98	14
99	13
100	13
101	13
102	17
103	13
104	7
105	13
106	18
107	13
108	7
109	13
110	17
111	13
112	17
113	13
114	19
115	13
116	17
117	13
118	20
119	13
120	7
121	21