A306384 - cp's OEIS frontend

A306384 Start with n and repeatedly double it and apply the "delete any run of identical digits" operation described in A321801; a(n) is the number of steps needed to reach one of 0, 1, or 5, or -1 if none of these three numbers is ever reached.

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

[0, 0, 19, 12, 18, 0, 11, 23, 17, 4, 19, 1, 10, 29, 22, 32, 16, 5, 3, 47, 18, 15, 1, 20, 9, 2, 28, 26, 21, 13, 31, 24, 15, 1, 4, 23, 2, 18, 46, 21, 17, 51, 14, 15, 1, 24, 19, 2, 8, 10, 1, 33, 27, 24, 25, 1, 20, 19, 12, 18, 30, 1, 23, 7, 14, 29, 6, 20, 3]

cp's OEIS Frontend

A306384 Start with n and repeatedly double it and apply the "delete any run of identical digits" operation described in A321801; a(n) is the number of steps needed to reach one of 0, 1, or 5, or -1 if none of these three numbers is ever reached.

Table of values

List of values

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

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

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