A367618 - cp's OEIS frontend

A367618 a(n) is the unique k such that n is a comma-child of k in base 3, or -1 if k does not exist.

n	a(n)
1	-1
2	-1
3	-1
4	3
5	1
6	1
7	-1
8	6
9	2
10	9
11	7
12	5
13	12
14	10
15	8
16	15
17	13
18	13
19	11
20	18
21	16
22	14
23	21
24	19
25	17
26	24
27	20
28	27
29	25
30	23
31	30
32	28
33	26
34	33
35	31
36	29
37	36
38	34
39	32
40	39
41	37
42	35
43	42
44	40
45	38
46	45
47	43
48	41
49	48
50	46
51	44
52	51
53	49
54	49
55	47
56	54
57	52
58	50
59	57
60	55
61	53
62	60
63	58
64	56
65	63
66	61
67	59
68	66
69	64
70	62
71	69
72	67
73	65
74	72
75	70
76	68
77	75
78	73
79	71
80	78
81	74
82	81
83	79
84	77
85	84
86	82

[-1, -1, -1, 3, 1, 1, -1, 6, 2, 9, 7, 5, 12, 10, 8, 15, 13, 13, 11, 18, 16, 14, 21, 19, 17, 24, 20, 27, 25, 23, 30, 28, 26, 33, 31, 29, 36, 34, 32, 39, 37, 35, 42, 40, 38, 45, 43, 41, 48, 46, 44, 51, 49, 49, 47, 54, 52, 50, 57, 55, 53, 60, 58, 56, 63, 61, 59, 66, 64, 62, 69, 67, 65, 72, 70, 68, 75, 73, 71, 78, 74, 81, 79, 77, 84, 82]

cp's OEIS Frontend

A367618 a(n) is the unique k such that n is a comma-child of k in base 3, or -1 if k does not exist.

Table of values

List of values

n	a(n)
1	-1
2	-1
3	-1
4	3
5	1
6	1
7	-1
8	6
9	2
10	9
11	7
12	5
13	12
14	10
15	8
16	15
17	13
18	13
19	11
20	18
21	16
22	14
23	21
24	19
25	17
26	24
27	20
28	27
29	25
30	23
31	30
32	28
33	26
34	33
35	31
36	29
37	36
38	34
39	32
40	39
41	37
42	35
43	42
44	40
45	38
46	45
47	43
48	41
49	48
50	46
51	44
52	51
53	49
54	49
55	47
56	54
57	52
58	50
59	57
60	55
61	53
62	60
63	58
64	56
65	63
66	61
67	59
68	66
69	64
70	62
71	69
72	67
73	65
74	72
75	70
76	68
77	75
78	73
79	71
80	78
81	74
82	81
83	79
84	77
85	84
86	82

n	a(n)
1	-1
2	-1
3	-1
4	3
5	1
6	1
7	-1
8	6
9	2
10	9
11	7
12	5
13	12
14	10
15	8
16	15
17	13
18	13
19	11
20	18
21	16
22	14
23	21
24	19
25	17
26	24
27	20
28	27
29	25
30	23
31	30
32	28
33	26
34	33
35	31
36	29
37	36
38	34
39	32
40	39
41	37
42	35
43	42
44	40
45	38
46	45
47	43
48	41
49	48
50	46
51	44
52	51
53	49
54	49
55	47
56	54
57	52
58	50
59	57
60	55
61	53
62	60
63	58
64	56
65	63
66	61
67	59
68	66
69	64
70	62
71	69
72	67
73	65
74	72
75	70
76	68
77	75
78	73
79	71
80	78
81	74
82	81
83	79
84	77
85	84
86	82

n	a(n)
1	-1
2	-1
3	-1
4	3
5	1
6	1
7	-1
8	6
9	2
10	9
11	7
12	5
13	12
14	10
15	8
16	15
17	13
18	13
19	11
20	18
21	16
22	14
23	21
24	19
25	17
26	24
27	20
28	27
29	25
30	23
31	30
32	28
33	26
34	33
35	31
36	29
37	36
38	34
39	32
40	39
41	37
42	35
43	42
44	40
45	38
46	45
47	43
48	41
49	48
50	46
51	44
52	51
53	49
54	49
55	47
56	54
57	52
58	50
59	57
60	55
61	53
62	60
63	58
64	56
65	63
66	61
67	59
68	66
69	64
70	62
71	69
72	67
73	65
74	72
75	70
76	68
77	75
78	73
79	71
80	78
81	74
82	81
83	79
84	77
85	84
86	82