A127428 - cp's OEIS frontend

A127428 v_5( (10n)! ) - v_5( (5n)! ), where v_p(N) is the p-adic valuation defined in A112765.

n	a(n)
0	0
1	1
2	2
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	12
11	13
12	14
13	17
14	18
15	19
16	20
17	21
18	23
19	24
20	25
21	26
22	27
23	29
24	30
25	31
26	32
27	33
28	35
29	36
30	37
31	38
32	39
33	41
34	42
35	43
36	44
37	45
38	48
39	49
40	50
41	51
42	52
43	54
44	55
45	56
46	57
47	58
48	60
49	61
50	62
51	63
52	64
53	66
54	67
55	68
56	69
57	70
58	72
59	73
60	74
61	75
62	76
63	80
64	81
65	82
66	83
67	84
68	86
69	87
70	88
71	89
72	90
73	92
74	93

[0, 1, 2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 72, 73, 74, 75, 76, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90, 92, 93]

cp's OEIS Frontend

A127428 v_5( (10n)! ) - v_5( (5n)! ), where v_p(N) is the p-adic valuation defined in A112765.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	12
11	13
12	14
13	17
14	18
15	19
16	20
17	21
18	23
19	24
20	25
21	26
22	27
23	29
24	30
25	31
26	32
27	33
28	35
29	36
30	37
31	38
32	39
33	41
34	42
35	43
36	44
37	45
38	48
39	49
40	50
41	51
42	52
43	54
44	55
45	56
46	57
47	58
48	60
49	61
50	62
51	63
52	64
53	66
54	67
55	68
56	69
57	70
58	72
59	73
60	74
61	75
62	76
63	80
64	81
65	82
66	83
67	84
68	86
69	87
70	88
71	89
72	90
73	92
74	93

n	a(n)
0	0
1	1
2	2
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	12
11	13
12	14
13	17
14	18
15	19
16	20
17	21
18	23
19	24
20	25
21	26
22	27
23	29
24	30
25	31
26	32
27	33
28	35
29	36
30	37
31	38
32	39
33	41
34	42
35	43
36	44
37	45
38	48
39	49
40	50
41	51
42	52
43	54
44	55
45	56
46	57
47	58
48	60
49	61
50	62
51	63
52	64
53	66
54	67
55	68
56	69
57	70
58	72
59	73
60	74
61	75
62	76
63	80
64	81
65	82
66	83
67	84
68	86
69	87
70	88
71	89
72	90
73	92
74	93

n	a(n)
0	0
1	1
2	2
3	4
4	5
5	6
6	7
7	8
8	10
9	11
10	12
11	13
12	14
13	17
14	18
15	19
16	20
17	21
18	23
19	24
20	25
21	26
22	27
23	29
24	30
25	31
26	32
27	33
28	35
29	36
30	37
31	38
32	39
33	41
34	42
35	43
36	44
37	45
38	48
39	49
40	50
41	51
42	52
43	54
44	55
45	56
46	57
47	58
48	60
49	61
50	62
51	63
52	64
53	66
54	67
55	68
56	69
57	70
58	72
59	73
60	74
61	75
62	76
63	80
64	81
65	82
66	83
67	84
68	86
69	87
70	88
71	89
72	90
73	92
74	93