A323835 - cp's OEIS frontend

A323835 Start with n and repeatedly double it and apply the "delete multiple digits" map m -> A320485(m); a(n) is the number of steps needed to reach either 0 or 1, or -1 if neither 0 nor 1 is ever reached.

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

[0, 0, 27, 12, 26, 41, 11, 31, 25, 4, 40, 1, 10, 37, 30, 43, 24, 35, 3, 42, 39, 15, 1, 20, 9, 2, 36, 26, 29, 13, 42, 32, 23, 1, 34, 44, 2, 18, 41, 21, 38, 45, 14, 15, 1, 45, 19, 2, 8, 30, 1, 20, 35, 2, 25, 1, 28, 27, 12, 26, 41, 1, 31, 43, 22, 34, 5, 20, 33, 30]

cp's OEIS Frontend

A323835 Start with n and repeatedly double it and apply the "delete multiple digits" map m -> A320485(m); a(n) is the number of steps needed to reach either 0 or 1, or -1 if neither 0 nor 1 is ever reached.

Table of values

List of values

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

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

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