A137178 - cp's OEIS frontend

A137178 a(n) = sum_(1..n) [S2(n)mod 2 - floor(5*S2(n)/7)mod 2], where S2(n) = binary weight of n.

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	1
6	0
7	1
8	2
9	1
10	0
11	1
12	0
13	1
14	2
15	2
16	3
17	2
18	1
19	2
20	1
21	2
22	3
23	3
24	2
25	3
26	4
27	4
28	5
29	5
30	5
31	5
32	6
33	5
34	4
35	5
36	4
37	5
38	6
39	6
40	5
41	6
42	7
43	7
44	8
45	8
46	8
47	8
48	7
49	8
50	9
51	9
52	10
53	10
54	10
55	10
56	11
57	11
58	11
59	11
60	11
61	11
62	11
63	11
64	12
65	11
66	10
67	11
68	10
69	11
70	12
71	12
72	11
73	12
74	13
75	13
76	14
77	14
78	14
79	14
80	13
81	14
82	15
83	15
84	16
85	16
86	16

[0, 1, 2, 1, 2, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 2, 3, 2, 1, 2, 1, 2, 3, 3, 2, 3, 4, 4, 5, 5, 5, 5, 6, 5, 4, 5, 4, 5, 6, 6, 5, 6, 7, 7, 8, 8, 8, 8, 7, 8, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12, 11, 10, 11, 10, 11, 12, 12, 11, 12, 13, 13, 14, 14, 14, 14, 13, 14, 15, 15, 16, 16, 16]

cp's OEIS Frontend

A137178 a(n) = sum_(1..n) [S2(n)mod 2 - floor(5*S2(n)/7)mod 2], where S2(n) = binary weight of n.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	1
6	0
7	1
8	2
9	1
10	0
11	1
12	0
13	1
14	2
15	2
16	3
17	2
18	1
19	2
20	1
21	2
22	3
23	3
24	2
25	3
26	4
27	4
28	5
29	5
30	5
31	5
32	6
33	5
34	4
35	5
36	4
37	5
38	6
39	6
40	5
41	6
42	7
43	7
44	8
45	8
46	8
47	8
48	7
49	8
50	9
51	9
52	10
53	10
54	10
55	10
56	11
57	11
58	11
59	11
60	11
61	11
62	11
63	11
64	12
65	11
66	10
67	11
68	10
69	11
70	12
71	12
72	11
73	12
74	13
75	13
76	14
77	14
78	14
79	14
80	13
81	14
82	15
83	15
84	16
85	16
86	16

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	1
6	0
7	1
8	2
9	1
10	0
11	1
12	0
13	1
14	2
15	2
16	3
17	2
18	1
19	2
20	1
21	2
22	3
23	3
24	2
25	3
26	4
27	4
28	5
29	5
30	5
31	5
32	6
33	5
34	4
35	5
36	4
37	5
38	6
39	6
40	5
41	6
42	7
43	7
44	8
45	8
46	8
47	8
48	7
49	8
50	9
51	9
52	10
53	10
54	10
55	10
56	11
57	11
58	11
59	11
60	11
61	11
62	11
63	11
64	12
65	11
66	10
67	11
68	10
69	11
70	12
71	12
72	11
73	12
74	13
75	13
76	14
77	14
78	14
79	14
80	13
81	14
82	15
83	15
84	16
85	16
86	16

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	1
6	0
7	1
8	2
9	1
10	0
11	1
12	0
13	1
14	2
15	2
16	3
17	2
18	1
19	2
20	1
21	2
22	3
23	3
24	2
25	3
26	4
27	4
28	5
29	5
30	5
31	5
32	6
33	5
34	4
35	5
36	4
37	5
38	6
39	6
40	5
41	6
42	7
43	7
44	8
45	8
46	8
47	8
48	7
49	8
50	9
51	9
52	10
53	10
54	10
55	10
56	11
57	11
58	11
59	11
60	11
61	11
62	11
63	11
64	12
65	11
66	10
67	11
68	10
69	11
70	12
71	12
72	11
73	12
74	13
75	13
76	14
77	14
78	14
79	14
80	13
81	14
82	15
83	15
84	16
85	16
86	16