A317441 - cp's OEIS frontend

A317441 a(n) = number of k with 1 <= k <= n-1 such that a(k) and a(n-k) have the same binary length (A070939).

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

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

cp's OEIS Frontend

A317441 a(n) = number of k with 1 <= k <= n-1 such that a(k) and a(n-k) have the same binary length (A070939).

Table of values

List of values

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

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

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