A090331 - cp's OEIS frontend

A090331 Largest proper divisor of n that is also a prefix of n in binary.

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

[1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 3, 8, 1, 9, 1, 10, 1, 11, 1, 12, 1, 13, 3, 14, 1, 15, 1, 16, 1, 17, 1, 18, 1, 19, 1, 20, 1, 21, 1, 22, 5, 23, 1, 24, 1, 25, 3, 26, 1, 27, 1, 28, 3, 29, 1, 30, 1, 31, 7, 32, 1, 33, 1, 34, 1, 35, 1, 36, 1, 37, 1, 38, 1, 39, 1, 40, 1, 41, 1, 42, 5, 43]

cp's OEIS Frontend

A090331 Largest proper divisor of n that is also a prefix of n in binary.

Table of values

List of values

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

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

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