A384656 - cp's OEIS frontend

A384656 a(n) = Sum_{k=1..n} A051903(ugcd(n,k)), where ugcd(n,k) is the greatest divisor of k that is a unitary divisor of n.

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

[0, 1, 1, 2, 1, 4, 1, 3, 2, 6, 1, 9, 1, 8, 7, 4, 1, 12, 1, 13, 9, 12, 1, 16, 2, 14, 3, 17, 1, 22, 1, 5, 13, 18, 11, 24, 1, 20, 15, 22, 1, 30, 1, 25, 18, 24, 1, 27, 2, 28, 19, 29, 1, 32, 15, 28, 21, 30, 1, 51, 1, 32, 22, 6, 17, 46, 1, 37, 25, 46, 1, 41, 1, 38, 30]

cp's OEIS Frontend

A384656 a(n) = Sum_{k=1..n} A051903(ugcd(n,k)), where ugcd(n,k) is the greatest divisor of k that is a unitary divisor of n.

Table of values

List of values

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

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

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