A342242 - cp's OEIS frontend

A342242 For any n > 0, a(n) is the least positive number whose binary expansion is both a prefix and a suffix of the binary expansion of n; a(0) = 0.

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

[0, 1, 2, 1, 4, 1, 6, 1, 8, 1, 2, 1, 12, 1, 14, 1, 16, 1, 2, 1, 20, 1, 2, 1, 24, 1, 26, 1, 28, 1, 30, 1, 32, 1, 2, 1, 4, 1, 2, 1, 40, 1, 2, 1, 44, 1, 2, 1, 48, 1, 50, 1, 52, 1, 6, 1, 56, 1, 58, 1, 60, 1, 62, 1, 64, 1, 2, 1, 4, 1, 2, 1, 72, 1, 2, 1, 4, 1, 2, 1]

cp's OEIS Frontend

A342242 For any n > 0, a(n) is the least positive number whose binary expansion is both a prefix and a suffix of the binary expansion of n; a(0) = 0.

Table of values

List of values

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

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

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