A027868 - cp's OEIS frontend

A027868 Number of trailing zeros in n!; highest power of 5 dividing n!.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	3
16	3
17	3
18	3
19	3
20	4
21	4
22	4
23	4
24	4
25	6
26	6
27	6
28	6
29	6
30	7
31	7
32	7
33	7
34	7
35	8
36	8
37	8
38	8
39	8
40	9
41	9
42	9
43	9
44	9
45	10
46	10
47	10
48	10
49	10
50	12
51	12
52	12
53	12
54	12
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	15
66	15
67	15
68	15
69	15
70	16
71	16
72	16
73	16
74	16
75	18
76	18
77	18
78	18
79	18
80	19

[0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 18, 18, 18, 18, 18, 19]

cp's OEIS Frontend

A027868 Number of trailing zeros in n!; highest power of 5 dividing n!.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	3
16	3
17	3
18	3
19	3
20	4
21	4
22	4
23	4
24	4
25	6
26	6
27	6
28	6
29	6
30	7
31	7
32	7
33	7
34	7
35	8
36	8
37	8
38	8
39	8
40	9
41	9
42	9
43	9
44	9
45	10
46	10
47	10
48	10
49	10
50	12
51	12
52	12
53	12
54	12
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	15
66	15
67	15
68	15
69	15
70	16
71	16
72	16
73	16
74	16
75	18
76	18
77	18
78	18
79	18
80	19

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	3
16	3
17	3
18	3
19	3
20	4
21	4
22	4
23	4
24	4
25	6
26	6
27	6
28	6
29	6
30	7
31	7
32	7
33	7
34	7
35	8
36	8
37	8
38	8
39	8
40	9
41	9
42	9
43	9
44	9
45	10
46	10
47	10
48	10
49	10
50	12
51	12
52	12
53	12
54	12
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	15
66	15
67	15
68	15
69	15
70	16
71	16
72	16
73	16
74	16
75	18
76	18
77	18
78	18
79	18
80	19

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	3
16	3
17	3
18	3
19	3
20	4
21	4
22	4
23	4
24	4
25	6
26	6
27	6
28	6
29	6
30	7
31	7
32	7
33	7
34	7
35	8
36	8
37	8
38	8
39	8
40	9
41	9
42	9
43	9
44	9
45	10
46	10
47	10
48	10
49	10
50	12
51	12
52	12
53	12
54	12
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	15
66	15
67	15
68	15
69	15
70	16
71	16
72	16
73	16
74	16
75	18
76	18
77	18
78	18
79	18
80	19