A069359 - cp's OEIS frontend

A069359 a(n) = n * Sum_{p|n} 1/p where p are primes dividing n.

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

[0, 1, 1, 2, 1, 5, 1, 4, 3, 7, 1, 10, 1, 9, 8, 8, 1, 15, 1, 14, 10, 13, 1, 20, 5, 15, 9, 18, 1, 31, 1, 16, 14, 19, 12, 30, 1, 21, 16, 28, 1, 41, 1, 26, 24, 25, 1, 40, 7, 35, 20, 30, 1, 45, 16, 36, 22, 31, 1, 62, 1, 33, 30, 32, 18, 61, 1, 38, 26, 59, 1, 60, 1, 39, 40, 42, 18, 71, 1, 56]

cp's OEIS Frontend

A069359 a(n) = n * Sum_{p|n} 1/p where p are primes dividing n.

Table of values

List of values

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

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

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