A125059 - cp's OEIS frontend

A125059 Number of digits in n!!.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	3
10	4
11	5
12	5
13	6
14	6
15	7
16	8
17	8
18	9
19	9
20	10
21	11
22	11
23	12
24	13
25	13
26	14
27	15
28	16
29	16
30	17
31	18
32	19
33	19
34	20
35	21
36	22
37	22
38	23
39	24
40	25
41	26
42	27
43	27
44	28
45	29
46	30
47	31
48	32
49	32
50	33
51	34
52	35
53	36
54	37
55	37
56	38
57	39
58	40
59	41
60	42
61	43
62	44
63	45
64	46
65	46
66	47
67	48
68	49
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57

[1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 6, 6, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13, 13, 14, 15, 16, 16, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31, 32, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57]

cp's OEIS Frontend

A125059 Number of digits in n!!.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	3
10	4
11	5
12	5
13	6
14	6
15	7
16	8
17	8
18	9
19	9
20	10
21	11
22	11
23	12
24	13
25	13
26	14
27	15
28	16
29	16
30	17
31	18
32	19
33	19
34	20
35	21
36	22
37	22
38	23
39	24
40	25
41	26
42	27
43	27
44	28
45	29
46	30
47	31
48	32
49	32
50	33
51	34
52	35
53	36
54	37
55	37
56	38
57	39
58	40
59	41
60	42
61	43
62	44
63	45
64	46
65	46
66	47
67	48
68	49
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	3
10	4
11	5
12	5
13	6
14	6
15	7
16	8
17	8
18	9
19	9
20	10
21	11
22	11
23	12
24	13
25	13
26	14
27	15
28	16
29	16
30	17
31	18
32	19
33	19
34	20
35	21
36	22
37	22
38	23
39	24
40	25
41	26
42	27
43	27
44	28
45	29
46	30
47	31
48	32
49	32
50	33
51	34
52	35
53	36
54	37
55	37
56	38
57	39
58	40
59	41
60	42
61	43
62	44
63	45
64	46
65	46
66	47
67	48
68	49
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	3
10	4
11	5
12	5
13	6
14	6
15	7
16	8
17	8
18	9
19	9
20	10
21	11
22	11
23	12
24	13
25	13
26	14
27	15
28	16
29	16
30	17
31	18
32	19
33	19
34	20
35	21
36	22
37	22
38	23
39	24
40	25
41	26
42	27
43	27
44	28
45	29
46	30
47	31
48	32
49	32
50	33
51	34
52	35
53	36
54	37
55	37
56	38
57	39
58	40
59	41
60	42
61	43
62	44
63	45
64	46
65	46
66	47
67	48
68	49
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57