A262679 - cp's OEIS frontend

A262679 a(n) = largest k in A259934 which is an ancestor of n in a tree generated by edge-relation A049820(child) = parent. If n is itself in A259934, then a(n) = n.

n	a(n)
0	0
1	0
2	2
3	0
4	0
5	0
6	6
7	0
8	0
9	6
10	6
11	6
12	12
13	6
14	6
15	6
16	6
17	6
18	18
19	6
20	6
21	6
22	22
23	6
24	6
25	22
26	22
27	6
28	22
29	6
30	30
31	6
32	22
33	6
34	34
35	6
36	6
37	6
38	34
39	6
40	22
41	6
42	42
43	6
44	34
45	6
46	46
47	6
48	34
49	46
50	34
51	6
52	46
53	6
54	54
55	6
56	34
57	6
58	58
59	6
60	34
61	6
62	62
63	6
64	6
65	6
66	58
67	6
68	62
69	6
70	70
71	6
72	34
73	6
74	70
75	6
76	70
77	6
78	78
79	6
80	70
81	70
82	78
83	70
84	34
85	70
86	78
87	70
88	70
89	70
90	90
91	70
92	78
93	70
94	94
95	70
96	34
97	70
98	78
99	70
100	70
101	70
102	102
103	70
104	34
105	70
106	106
107	70
108	34
109	70
110	102
111	70
112	102
113	70
114	114
115	70
116	102
117	70
118	118
119	70
120	34
121	121
122	118
123	70

[0, 0, 2, 0, 0, 0, 6, 0, 0, 6, 6, 6, 12, 6, 6, 6, 6, 6, 18, 6, 6, 6, 22, 6, 6, 22, 22, 6, 22, 6, 30, 6, 22, 6, 34, 6, 6, 6, 34, 6, 22, 6, 42, 6, 34, 6, 46, 6, 34, 46, 34, 6, 46, 6, 54, 6, 34, 6, 58, 6, 34, 6, 62, 6, 6, 6, 58, 6, 62, 6, 70, 6, 34, 6, 70, 6, 70, 6, 78, 6, 70, 70, 78, 70, 34, 70, 78, 70, 70, 70, 90, 70, 78, 70, 94, 70, 34, 70, 78, 70, 70, 70, 102, 70, 34, 70, 106, 70, 34, 70, 102, 70, 102, 70, 114, 70, 102, 70, 118, 70, 34, 121, 118, 70]

cp's OEIS Frontend

A262679 a(n) = largest k in A259934 which is an ancestor of n in a tree generated by edge-relation A049820(child) = parent. If n is itself in A259934, then a(n) = n.

Table of values

List of values

n	a(n)
0	0
1	0
2	2
3	0
4	0
5	0
6	6
7	0
8	0
9	6
10	6
11	6
12	12
13	6
14	6
15	6
16	6
17	6
18	18
19	6
20	6
21	6
22	22
23	6
24	6
25	22
26	22
27	6
28	22
29	6
30	30
31	6
32	22
33	6
34	34
35	6
36	6
37	6
38	34
39	6
40	22
41	6
42	42
43	6
44	34
45	6
46	46
47	6
48	34
49	46
50	34
51	6
52	46
53	6
54	54
55	6
56	34
57	6
58	58
59	6
60	34
61	6
62	62
63	6
64	6
65	6
66	58
67	6
68	62
69	6
70	70
71	6
72	34
73	6
74	70
75	6
76	70
77	6
78	78
79	6
80	70
81	70
82	78
83	70
84	34
85	70
86	78
87	70
88	70
89	70
90	90
91	70
92	78
93	70
94	94
95	70
96	34
97	70
98	78
99	70
100	70
101	70
102	102
103	70
104	34
105	70
106	106
107	70
108	34
109	70
110	102
111	70
112	102
113	70
114	114
115	70
116	102
117	70
118	118
119	70
120	34
121	121
122	118
123	70

n	a(n)
0	0
1	0
2	2
3	0
4	0
5	0
6	6
7	0
8	0
9	6
10	6
11	6
12	12
13	6
14	6
15	6
16	6
17	6
18	18
19	6
20	6
21	6
22	22
23	6
24	6
25	22
26	22
27	6
28	22
29	6
30	30
31	6
32	22
33	6
34	34
35	6
36	6
37	6
38	34
39	6
40	22
41	6
42	42
43	6
44	34
45	6
46	46
47	6
48	34
49	46
50	34
51	6
52	46
53	6
54	54
55	6
56	34
57	6
58	58
59	6
60	34
61	6
62	62
63	6
64	6
65	6
66	58
67	6
68	62
69	6
70	70
71	6
72	34
73	6
74	70
75	6
76	70
77	6
78	78
79	6
80	70
81	70
82	78
83	70
84	34
85	70
86	78
87	70
88	70
89	70
90	90
91	70
92	78
93	70
94	94
95	70
96	34
97	70
98	78
99	70
100	70
101	70
102	102
103	70
104	34
105	70
106	106
107	70
108	34
109	70
110	102
111	70
112	102
113	70
114	114
115	70
116	102
117	70
118	118
119	70
120	34
121	121
122	118
123	70

n	a(n)
0	0
1	0
2	2
3	0
4	0
5	0
6	6
7	0
8	0
9	6
10	6
11	6
12	12
13	6
14	6
15	6
16	6
17	6
18	18
19	6
20	6
21	6
22	22
23	6
24	6
25	22
26	22
27	6
28	22
29	6
30	30
31	6
32	22
33	6
34	34
35	6
36	6
37	6
38	34
39	6
40	22
41	6
42	42
43	6
44	34
45	6
46	46
47	6
48	34
49	46
50	34
51	6
52	46
53	6
54	54
55	6
56	34
57	6
58	58
59	6
60	34
61	6
62	62
63	6
64	6
65	6
66	58
67	6
68	62
69	6
70	70
71	6
72	34
73	6
74	70
75	6
76	70
77	6
78	78
79	6
80	70
81	70
82	78
83	70
84	34
85	70
86	78
87	70
88	70
89	70
90	90
91	70
92	78
93	70
94	94
95	70
96	34
97	70
98	78
99	70
100	70
101	70
102	102
103	70
104	34
105	70
106	106
107	70
108	34
109	70
110	102
111	70
112	102
113	70
114	114
115	70
116	102
117	70
118	118
119	70
120	34
121	121
122	118
123	70