A369915 - cp's OEIS frontend

A369915 a(n) = Sum_{p|n, p prime} lcm(p, n/p) / p.

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

[0, 1, 1, 1, 1, 5, 1, 2, 1, 7, 1, 7, 1, 9, 8, 4, 1, 11, 1, 9, 10, 13, 1, 14, 1, 15, 3, 11, 1, 31, 1, 8, 14, 19, 12, 13, 1, 21, 16, 18, 1, 41, 1, 15, 14, 25, 1, 28, 1, 27, 20, 17, 1, 33, 16, 22, 22, 31, 1, 47, 1, 33, 16, 16, 18, 61, 1, 21, 26, 59, 1, 26, 1, 39, 28, 23, 18]

cp's OEIS Frontend

A369915 a(n) = Sum_{p|n, p prime} lcm(p, n/p) / p.

Table of values

List of values

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

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

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