A337532 - cp's OEIS frontend

A337532 a(n) = Sum_{d1|n, d2|n, d1<=d2} [(d1 mod 2) = (d2 mod 2)], where [ ] is the Iverson bracket.

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

[1, 2, 3, 4, 3, 6, 3, 7, 6, 6, 3, 13, 3, 6, 10, 11, 3, 12, 3, 13, 10, 6, 3, 24, 6, 6, 10, 13, 3, 20, 3, 16, 10, 6, 10, 27, 3, 6, 10, 24, 3, 20, 3, 13, 21, 6, 3, 39, 6, 12, 10, 13, 3, 20, 10, 24, 10, 6, 3, 46, 3, 6, 21, 22, 10, 20, 3, 13, 10, 20, 3, 51, 3, 6, 21, 13, 10, 20, 3, 39]

cp's OEIS Frontend

A337532 a(n) = Sum_{d1|n, d2|n, d1<=d2} [(d1 mod 2) = (d2 mod 2)], where [ ] is the Iverson bracket.

Table of values

List of values

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

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

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