A078181 - cp's OEIS frontend

A078181 a(n) = Sum_{d|n, d == 1 (mod 3)} d.

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

[1, 1, 1, 5, 1, 1, 8, 5, 1, 11, 1, 5, 14, 8, 1, 21, 1, 1, 20, 15, 8, 23, 1, 5, 26, 14, 1, 40, 1, 11, 32, 21, 1, 35, 8, 5, 38, 20, 14, 55, 1, 8, 44, 27, 1, 47, 1, 21, 57, 36, 1, 70, 1, 1, 56, 40, 20, 59, 1, 15, 62, 32, 8, 85, 14, 23, 68, 39, 1, 88, 1, 5, 74, 38, 26, 100, 8, 14, 80, 71, 1]

cp's OEIS Frontend

A078181 a(n) = Sum_{d|n, d == 1 (mod 3)} d.

Table of values

List of values

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

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

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