A327987 - cp's OEIS frontend

A327987 a(n) = Sum_{d|n} d & (n/d), where & is the bitwise AND operator, with a(0) = 0.

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

[0, 1, 0, 2, 2, 2, 4, 2, 0, 5, 0, 2, 4, 2, 4, 4, 4, 2, 4, 2, 12, 8, 4, 2, 8, 7, 0, 4, 12, 2, 16, 2, 0, 8, 0, 12, 10, 2, 4, 4, 0, 2, 16, 2, 4, 10, 4, 2, 8, 9, 0, 4, 12, 2, 8, 4, 8, 8, 0, 2, 24, 2, 4, 6, 8, 12, 8, 2, 4, 8, 16, 2, 24, 2, 0, 14, 4, 8, 16, 2, 24, 17]

cp's OEIS Frontend

A327987 a(n) = Sum_{d|n} d & (n/d), where & is the bitwise AND operator, with a(0) = 0.

Table of values

List of values

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

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

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