A161825 - cp's OEIS frontend

A161825 a(n) is the GCD of n and {the number made by reversing the order of the digits of n written in binary}.

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

[1, 1, 3, 1, 5, 3, 7, 1, 9, 5, 1, 3, 1, 7, 15, 1, 17, 9, 1, 5, 21, 1, 1, 3, 1, 1, 27, 7, 1, 15, 31, 1, 33, 17, 7, 9, 1, 1, 3, 5, 1, 21, 1, 1, 45, 1, 1, 3, 7, 1, 51, 1, 1, 27, 1, 7, 3, 1, 1, 15, 1, 31, 63, 1, 65, 33, 1, 17, 3, 7, 1, 9, 73, 1, 15, 1, 1, 3, 1, 5, 3, 1, 1, 21, 85, 1, 3, 1, 1, 45, 1, 1, 93, 1]

cp's OEIS Frontend

A161825 a(n) is the GCD of n and {the number made by reversing the order of the digits of n written in binary}.

Table of values

List of values

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

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

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