A323286 - cp's OEIS frontend

A323286 Choix de Bruxelles (version 1): irregular table read by rows in which row n lists all the legal numbers that can be reached by halving or doubling some substring of the decimal expansion of n.

n	a(n)
1	2
2	1
3	4
4	6
5	2
6	8
7	10
8	3
9	12
10	14
11	4
12	16
13	18
14	5
15	20
16	12
17	21
18	22
19	6
20	11
21	14
22	22
23	24
24	16
25	23
26	26
27	7
28	12
29	18
30	24
31	28
32	25
33	30
34	110
35	8
36	13
37	26
38	32
39	112
40	27
41	34
42	114
43	9
44	14
45	28
46	36
47	116
48	29
49	38
50	118
51	10
52	40
53	11
54	22
55	41
56	42
57	11
58	12
59	21
60	24
61	42
62	44
63	13
64	26
65	43
66	46
67	12

[2, 1, 4, 6, 2, 8, 10, 3, 12, 14, 4, 16, 18, 5, 20, 12, 21, 22, 6, 11, 14, 22, 24, 16, 23, 26, 7, 12, 18, 24, 28, 25, 30, 110, 8, 13, 26, 32, 112, 27, 34, 114, 9, 14, 28, 36, 116, 29, 38, 118, 10, 40, 11, 22, 41, 42, 11, 12, 21, 24, 42, 44, 13, 26, 43, 46, 12]

cp's OEIS Frontend

A323286 Choix de Bruxelles (version 1): irregular table read by rows in which row n lists all the legal numbers that can be reached by halving or doubling some substring of the decimal expansion of n.

Table of values

List of values

n	a(n)
1	2
2	1
3	4
4	6
5	2
6	8
7	10
8	3
9	12
10	14
11	4
12	16
13	18
14	5
15	20
16	12
17	21
18	22
19	6
20	11
21	14
22	22
23	24
24	16
25	23
26	26
27	7
28	12
29	18
30	24
31	28
32	25
33	30
34	110
35	8
36	13
37	26
38	32
39	112
40	27
41	34
42	114
43	9
44	14
45	28
46	36
47	116
48	29
49	38
50	118
51	10
52	40
53	11
54	22
55	41
56	42
57	11
58	12
59	21
60	24
61	42
62	44
63	13
64	26
65	43
66	46
67	12

n	a(n)
1	2
2	1
3	4
4	6
5	2
6	8
7	10
8	3
9	12
10	14
11	4
12	16
13	18
14	5
15	20
16	12
17	21
18	22
19	6
20	11
21	14
22	22
23	24
24	16
25	23
26	26
27	7
28	12
29	18
30	24
31	28
32	25
33	30
34	110
35	8
36	13
37	26
38	32
39	112
40	27
41	34
42	114
43	9
44	14
45	28
46	36
47	116
48	29
49	38
50	118
51	10
52	40
53	11
54	22
55	41
56	42
57	11
58	12
59	21
60	24
61	42
62	44
63	13
64	26
65	43
66	46
67	12

n	a(n)
1	2
2	1
3	4
4	6
5	2
6	8
7	10
8	3
9	12
10	14
11	4
12	16
13	18
14	5
15	20
16	12
17	21
18	22
19	6
20	11
21	14
22	22
23	24
24	16
25	23
26	26
27	7
28	12
29	18
30	24
31	28
32	25
33	30
34	110
35	8
36	13
37	26
38	32
39	112
40	27
41	34
42	114
43	9
44	14
45	28
46	36
47	116
48	29
49	38
50	118
51	10
52	40
53	11
54	22
55	41
56	42
57	11
58	12
59	21
60	24
61	42
62	44
63	13
64	26
65	43
66	46
67	12