A025646 - cp's OEIS frontend

A025646 Exponent of 4 (value of i) in n-th number of form 4^i*5^j.

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	0
7	3
8	2
9	1
10	0
11	4
12	3
13	2
14	1
15	0
16	5
17	4
18	3
19	2
20	1
21	0
22	6
23	5
24	4
25	3
26	2
27	1
28	0
29	7
30	6
31	5
32	4
33	3
34	2
35	1
36	8
37	0
38	7
39	6
40	5
41	4
42	3
43	2
44	9
45	1
46	8
47	0
48	7
49	6
50	5
51	4
52	3
53	10
54	2
55	9
56	1
57	8
58	0
59	7
60	6
61	5
62	4
63	11
64	3
65	10
66	2
67	9
68	1
69	8
70	0
71	7
72	6
73	5
74	12
75	4
76	11
77	3
78	10
79	2
80	9
81	1
82	8
83	0
84	7
85	6
86	13
87	5
88	12
89	4
90	11
91	3
92	10
93	2
94	9
95	1
96	8
97	0
98	7
99	14
100	6
101	13

[0, 1, 0, 2, 1, 0, 3, 2, 1, 0, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 8, 0, 7, 6, 5, 4, 3, 2, 9, 1, 8, 0, 7, 6, 5, 4, 3, 10, 2, 9, 1, 8, 0, 7, 6, 5, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 6, 5, 12, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 6, 13, 5, 12, 4, 11, 3, 10, 2, 9, 1, 8, 0, 7, 14, 6, 13]

cp's OEIS Frontend

A025646 Exponent of 4 (value of i) in n-th number of form 4^i*5^j.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	0
7	3
8	2
9	1
10	0
11	4
12	3
13	2
14	1
15	0
16	5
17	4
18	3
19	2
20	1
21	0
22	6
23	5
24	4
25	3
26	2
27	1
28	0
29	7
30	6
31	5
32	4
33	3
34	2
35	1
36	8
37	0
38	7
39	6
40	5
41	4
42	3
43	2
44	9
45	1
46	8
47	0
48	7
49	6
50	5
51	4
52	3
53	10
54	2
55	9
56	1
57	8
58	0
59	7
60	6
61	5
62	4
63	11
64	3
65	10
66	2
67	9
68	1
69	8
70	0
71	7
72	6
73	5
74	12
75	4
76	11
77	3
78	10
79	2
80	9
81	1
82	8
83	0
84	7
85	6
86	13
87	5
88	12
89	4
90	11
91	3
92	10
93	2
94	9
95	1
96	8
97	0
98	7
99	14
100	6
101	13

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	0
7	3
8	2
9	1
10	0
11	4
12	3
13	2
14	1
15	0
16	5
17	4
18	3
19	2
20	1
21	0
22	6
23	5
24	4
25	3
26	2
27	1
28	0
29	7
30	6
31	5
32	4
33	3
34	2
35	1
36	8
37	0
38	7
39	6
40	5
41	4
42	3
43	2
44	9
45	1
46	8
47	0
48	7
49	6
50	5
51	4
52	3
53	10
54	2
55	9
56	1
57	8
58	0
59	7
60	6
61	5
62	4
63	11
64	3
65	10
66	2
67	9
68	1
69	8
70	0
71	7
72	6
73	5
74	12
75	4
76	11
77	3
78	10
79	2
80	9
81	1
82	8
83	0
84	7
85	6
86	13
87	5
88	12
89	4
90	11
91	3
92	10
93	2
94	9
95	1
96	8
97	0
98	7
99	14
100	6
101	13

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	0
7	3
8	2
9	1
10	0
11	4
12	3
13	2
14	1
15	0
16	5
17	4
18	3
19	2
20	1
21	0
22	6
23	5
24	4
25	3
26	2
27	1
28	0
29	7
30	6
31	5
32	4
33	3
34	2
35	1
36	8
37	0
38	7
39	6
40	5
41	4
42	3
43	2
44	9
45	1
46	8
47	0
48	7
49	6
50	5
51	4
52	3
53	10
54	2
55	9
56	1
57	8
58	0
59	7
60	6
61	5
62	4
63	11
64	3
65	10
66	2
67	9
68	1
69	8
70	0
71	7
72	6
73	5
74	12
75	4
76	11
77	3
78	10
79	2
80	9
81	1
82	8
83	0
84	7
85	6
86	13
87	5
88	12
89	4
90	11
91	3
92	10
93	2
94	9
95	1
96	8
97	0
98	7
99	14
100	6
101	13