A358854 - cp's OEIS frontend

A358854 Number of even digits necessary to write all the numbers from 0 up to n.

n	a(n)
0	1
1	1
2	2
3	2
4	3
5	3
6	4
7	4
8	5
9	5
10	6
11	6
12	7
13	7
14	8
15	8
16	9
17	9
18	10
19	10
20	12
21	13
22	15
23	16
24	18
25	19
26	21
27	22
28	24
29	25
30	26
31	26
32	27
33	27
34	28
35	28
36	29
37	29
38	30
39	30
40	32
41	33
42	35
43	36
44	38
45	39
46	41
47	42
48	44
49	45
50	46
51	46
52	47
53	47
54	48
55	48
56	49
57	49
58	50
59	50
60	52
61	53
62	55
63	56
64	58
65	59
66	61
67	62
68	64
69	65
70	66
71	66
72	67
73	67
74	68
75	68

[1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 12, 13, 15, 16, 18, 19, 21, 22, 24, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 32, 33, 35, 36, 38, 39, 41, 42, 44, 45, 46, 46, 47, 47, 48, 48, 49, 49, 50, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 66, 66, 67, 67, 68, 68]

cp's OEIS Frontend

A358854 Number of even digits necessary to write all the numbers from 0 up to n.

Table of values

List of values

n	a(n)
0	1
1	1
2	2
3	2
4	3
5	3
6	4
7	4
8	5
9	5
10	6
11	6
12	7
13	7
14	8
15	8
16	9
17	9
18	10
19	10
20	12
21	13
22	15
23	16
24	18
25	19
26	21
27	22
28	24
29	25
30	26
31	26
32	27
33	27
34	28
35	28
36	29
37	29
38	30
39	30
40	32
41	33
42	35
43	36
44	38
45	39
46	41
47	42
48	44
49	45
50	46
51	46
52	47
53	47
54	48
55	48
56	49
57	49
58	50
59	50
60	52
61	53
62	55
63	56
64	58
65	59
66	61
67	62
68	64
69	65
70	66
71	66
72	67
73	67
74	68
75	68

n	a(n)
0	1
1	1
2	2
3	2
4	3
5	3
6	4
7	4
8	5
9	5
10	6
11	6
12	7
13	7
14	8
15	8
16	9
17	9
18	10
19	10
20	12
21	13
22	15
23	16
24	18
25	19
26	21
27	22
28	24
29	25
30	26
31	26
32	27
33	27
34	28
35	28
36	29
37	29
38	30
39	30
40	32
41	33
42	35
43	36
44	38
45	39
46	41
47	42
48	44
49	45
50	46
51	46
52	47
53	47
54	48
55	48
56	49
57	49
58	50
59	50
60	52
61	53
62	55
63	56
64	58
65	59
66	61
67	62
68	64
69	65
70	66
71	66
72	67
73	67
74	68
75	68

n	a(n)
0	1
1	1
2	2
3	2
4	3
5	3
6	4
7	4
8	5
9	5
10	6
11	6
12	7
13	7
14	8
15	8
16	9
17	9
18	10
19	10
20	12
21	13
22	15
23	16
24	18
25	19
26	21
27	22
28	24
29	25
30	26
31	26
32	27
33	27
34	28
35	28
36	29
37	29
38	30
39	30
40	32
41	33
42	35
43	36
44	38
45	39
46	41
47	42
48	44
49	45
50	46
51	46
52	47
53	47
54	48
55	48
56	49
57	49
58	50
59	50
60	52
61	53
62	55
63	56
64	58
65	59
66	61
67	62
68	64
69	65
70	66
71	66
72	67
73	67
74	68
75	68