A025639 - cp's OEIS frontend

A025639 Exponent of 2 (value of i) in n-th number of form 2^i*10^j.

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

[0, 1, 2, 3, 0, 4, 1, 5, 2, 6, 3, 0, 7, 4, 1, 8, 5, 2, 9, 6, 3, 0, 10, 7, 4, 1, 11, 8, 5, 2, 12, 9, 6, 3, 13, 0, 10, 7, 4, 14, 1, 11, 8, 5, 15, 2, 12, 9, 6, 16, 3, 13, 0, 10, 7, 17, 4, 14, 1, 11, 8, 18, 5, 15, 2, 12, 9, 19, 6, 16, 3, 13, 0, 10, 20, 7, 17, 4, 14, 1, 11, 21, 8, 18, 5, 15, 2, 12, 22, 9, 19]

cp's OEIS Frontend

A025639 Exponent of 2 (value of i) in n-th number of form 2^i*10^j.

Table of values

List of values

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

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

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