A000120 - cp's OEIS frontend

A000120 1's-counting sequence: number of 1's in binary expansion of n (or the binary weight of n).

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	2
6	2
7	3
8	1
9	2
10	2
11	3
12	2
13	3
14	3
15	4
16	1
17	2
18	2
19	3
20	2
21	3
22	3
23	4
24	2
25	3
26	3
27	4
28	3
29	4
30	4
31	5
32	1
33	2
34	2
35	3
36	2
37	3
38	3
39	4
40	2
41	3
42	3
43	4
44	3
45	4
46	4
47	5
48	2
49	3
50	3
51	4
52	3
53	4
54	4
55	5
56	3
57	4
58	4
59	5
60	4
61	5
62	5
63	6
64	1
65	2
66	2
67	3
68	2
69	3
70	3
71	4
72	2
73	3
74	3
75	4
76	3
77	4
78	4
79	5
80	2
81	3
82	3
83	4
84	3
85	4
86	4
87	5
88	3
89	4
90	4
91	5
92	4
93	5
94	5
95	6
96	2
97	3
98	3
99	4
100	3
101	4
102	4
103	5
104	3

[0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3]

cp's OEIS Frontend

A000120 1's-counting sequence: number of 1's in binary expansion of n (or the binary weight of n).

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	2
6	2
7	3
8	1
9	2
10	2
11	3
12	2
13	3
14	3
15	4
16	1
17	2
18	2
19	3
20	2
21	3
22	3
23	4
24	2
25	3
26	3
27	4
28	3
29	4
30	4
31	5
32	1
33	2
34	2
35	3
36	2
37	3
38	3
39	4
40	2
41	3
42	3
43	4
44	3
45	4
46	4
47	5
48	2
49	3
50	3
51	4
52	3
53	4
54	4
55	5
56	3
57	4
58	4
59	5
60	4
61	5
62	5
63	6
64	1
65	2
66	2
67	3
68	2
69	3
70	3
71	4
72	2
73	3
74	3
75	4
76	3
77	4
78	4
79	5
80	2
81	3
82	3
83	4
84	3
85	4
86	4
87	5
88	3
89	4
90	4
91	5
92	4
93	5
94	5
95	6
96	2
97	3
98	3
99	4
100	3
101	4
102	4
103	5
104	3

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	2
6	2
7	3
8	1
9	2
10	2
11	3
12	2
13	3
14	3
15	4
16	1
17	2
18	2
19	3
20	2
21	3
22	3
23	4
24	2
25	3
26	3
27	4
28	3
29	4
30	4
31	5
32	1
33	2
34	2
35	3
36	2
37	3
38	3
39	4
40	2
41	3
42	3
43	4
44	3
45	4
46	4
47	5
48	2
49	3
50	3
51	4
52	3
53	4
54	4
55	5
56	3
57	4
58	4
59	5
60	4
61	5
62	5
63	6
64	1
65	2
66	2
67	3
68	2
69	3
70	3
71	4
72	2
73	3
74	3
75	4
76	3
77	4
78	4
79	5
80	2
81	3
82	3
83	4
84	3
85	4
86	4
87	5
88	3
89	4
90	4
91	5
92	4
93	5
94	5
95	6
96	2
97	3
98	3
99	4
100	3
101	4
102	4
103	5
104	3

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	2
6	2
7	3
8	1
9	2
10	2
11	3
12	2
13	3
14	3
15	4
16	1
17	2
18	2
19	3
20	2
21	3
22	3
23	4
24	2
25	3
26	3
27	4
28	3
29	4
30	4
31	5
32	1
33	2
34	2
35	3
36	2
37	3
38	3
39	4
40	2
41	3
42	3
43	4
44	3
45	4
46	4
47	5
48	2
49	3
50	3
51	4
52	3
53	4
54	4
55	5
56	3
57	4
58	4
59	5
60	4
61	5
62	5
63	6
64	1
65	2
66	2
67	3
68	2
69	3
70	3
71	4
72	2
73	3
74	3
75	4
76	3
77	4
78	4
79	5
80	2
81	3
82	3
83	4
84	3
85	4
86	4
87	5
88	3
89	4
90	4
91	5
92	4
93	5
94	5
95	6
96	2
97	3
98	3
99	4
100	3
101	4
102	4
103	5
104	3