A345305 - cp's OEIS frontend

A345305 a(n) = n * Sum_{p|n, p prime} gcd(p,n/p) / p.

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	5
7	1
8	8
9	9
10	7
11	1
12	16
13	1
14	9
15	8
16	16
17	1
18	27
19	1
20	24
21	10
22	13
23	1
24	32
25	25
26	15
27	27
28	32
29	1
30	31
31	1
32	32
33	14
34	19
35	12
36	72
37	1
38	21
39	16
40	48
41	1
42	41
43	1
44	48
45	54
46	25
47	1
48	64
49	49
50	75
51	20
52	56
53	1
54	81
55	16
56	64
57	22
58	31
59	1
60	92
61	1
62	33
63	72
64	64
65	18
66	61
67	1
68	72
69	26
70	59
71	1
72	144
73	1
74	39
75	100
76	80
77	18

[0, 1, 1, 4, 1, 5, 1, 8, 9, 7, 1, 16, 1, 9, 8, 16, 1, 27, 1, 24, 10, 13, 1, 32, 25, 15, 27, 32, 1, 31, 1, 32, 14, 19, 12, 72, 1, 21, 16, 48, 1, 41, 1, 48, 54, 25, 1, 64, 49, 75, 20, 56, 1, 81, 16, 64, 22, 31, 1, 92, 1, 33, 72, 64, 18, 61, 1, 72, 26, 59, 1, 144, 1, 39, 100, 80, 18]

cp's OEIS Frontend

A345305 a(n) = n * Sum_{p|n, p prime} gcd(p,n/p) / p.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	5
7	1
8	8
9	9
10	7
11	1
12	16
13	1
14	9
15	8
16	16
17	1
18	27
19	1
20	24
21	10
22	13
23	1
24	32
25	25
26	15
27	27
28	32
29	1
30	31
31	1
32	32
33	14
34	19
35	12
36	72
37	1
38	21
39	16
40	48
41	1
42	41
43	1
44	48
45	54
46	25
47	1
48	64
49	49
50	75
51	20
52	56
53	1
54	81
55	16
56	64
57	22
58	31
59	1
60	92
61	1
62	33
63	72
64	64
65	18
66	61
67	1
68	72
69	26
70	59
71	1
72	144
73	1
74	39
75	100
76	80
77	18

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	5
7	1
8	8
9	9
10	7
11	1
12	16
13	1
14	9
15	8
16	16
17	1
18	27
19	1
20	24
21	10
22	13
23	1
24	32
25	25
26	15
27	27
28	32
29	1
30	31
31	1
32	32
33	14
34	19
35	12
36	72
37	1
38	21
39	16
40	48
41	1
42	41
43	1
44	48
45	54
46	25
47	1
48	64
49	49
50	75
51	20
52	56
53	1
54	81
55	16
56	64
57	22
58	31
59	1
60	92
61	1
62	33
63	72
64	64
65	18
66	61
67	1
68	72
69	26
70	59
71	1
72	144
73	1
74	39
75	100
76	80
77	18

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	5
7	1
8	8
9	9
10	7
11	1
12	16
13	1
14	9
15	8
16	16
17	1
18	27
19	1
20	24
21	10
22	13
23	1
24	32
25	25
26	15
27	27
28	32
29	1
30	31
31	1
32	32
33	14
34	19
35	12
36	72
37	1
38	21
39	16
40	48
41	1
42	41
43	1
44	48
45	54
46	25
47	1
48	64
49	49
50	75
51	20
52	56
53	1
54	81
55	16
56	64
57	22
58	31
59	1
60	92
61	1
62	33
63	72
64	64
65	18
66	61
67	1
68	72
69	26
70	59
71	1
72	144
73	1
74	39
75	100
76	80
77	18