A331804 - cp's OEIS frontend

A331804 a(n) is the largest positive integer occurring, when written in binary, as a substring in both binary n and its reversal (A030101(n)).

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

[0, 1, 1, 3, 1, 5, 3, 7, 1, 9, 5, 5, 3, 5, 7, 15, 1, 17, 9, 9, 5, 21, 6, 7, 3, 9, 5, 27, 7, 7, 15, 31, 1, 33, 17, 17, 9, 9, 9, 9, 5, 9, 21, 21, 6, 45, 14, 15, 3, 17, 9, 51, 5, 21, 27, 27, 7, 9, 7, 27, 15, 15, 31, 63, 1, 65, 33, 33, 17, 17, 17, 17, 9, 73, 10, 9]

cp's OEIS Frontend

A331804 a(n) is the largest positive integer occurring, when written in binary, as a substring in both binary n and its reversal (A030101(n)).

Table of values

List of values

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

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

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