A139351 - cp's OEIS frontend

A139351 Let the binary expansion of n be n = Sum_{k} 2^{r_k}, let e(n) be the number of r_k's that are even, o(n) the number that are odd; sequence gives e(n).

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

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

cp's OEIS Frontend

A139351 Let the binary expansion of n be n = Sum_{k} 2^{r_k}, let e(n) be the number of r_k's that are even, o(n) the number that are odd; sequence gives e(n).

Table of values

List of values

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

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

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