A034887 - cp's OEIS frontend

A034887 Number of digits in 2^n.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	2
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	5
15	5
16	5
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	8
25	8
26	8
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	11
35	11
36	11
37	12
38	12
39	12
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	15
48	15
49	15
50	16
51	16
52	16
53	16
54	17
55	17
56	17
57	18
58	18
59	18
60	19
61	19
62	19
63	19
64	20
65	20
66	20
67	21
68	21
69	21
70	22
71	22
72	22

[1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 21, 21, 21, 22, 22, 22]

cp's OEIS Frontend

A034887 Number of digits in 2^n.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	2
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	5
15	5
16	5
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	8
25	8
26	8
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	11
35	11
36	11
37	12
38	12
39	12
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	15
48	15
49	15
50	16
51	16
52	16
53	16
54	17
55	17
56	17
57	18
58	18
59	18
60	19
61	19
62	19
63	19
64	20
65	20
66	20
67	21
68	21
69	21
70	22
71	22
72	22

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	2
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	5
15	5
16	5
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	8
25	8
26	8
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	11
35	11
36	11
37	12
38	12
39	12
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	15
48	15
49	15
50	16
51	16
52	16
53	16
54	17
55	17
56	17
57	18
58	18
59	18
60	19
61	19
62	19
63	19
64	20
65	20
66	20
67	21
68	21
69	21
70	22
71	22
72	22

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	2
7	3
8	3
9	3
10	4
11	4
12	4
13	4
14	5
15	5
16	5
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	8
25	8
26	8
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	11
35	11
36	11
37	12
38	12
39	12
40	13
41	13
42	13
43	13
44	14
45	14
46	14
47	15
48	15
49	15
50	16
51	16
52	16
53	16
54	17
55	17
56	17
57	18
58	18
59	18
60	19
61	19
62	19
63	19
64	20
65	20
66	20
67	21
68	21
69	21
70	22
71	22
72	22