A068976 - cp's OEIS frontend

A068976 a(n) = Sum_{d | n} d/core(d) where core(x) is the smallest number such that x*core(x) is a square.

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	4
7	2
8	10
9	11
10	4
11	2
12	12
13	2
14	4
15	4
16	26
17	2
18	22
19	2
20	12
21	4
22	4
23	2
24	20
25	27
26	4
27	20
28	12
29	2
30	8
31	2
32	42
33	4
34	4
35	4
36	66
37	2
38	4
39	4
40	20
41	2
42	8
43	2
44	12
45	22
46	4
47	2
48	52
49	51
50	54
51	4
52	12
53	2
54	40
55	4
56	20
57	4
58	4
59	2
60	24
61	2
62	4
63	22
64	106
65	4
66	8
67	2
68	12
69	4
70	8
71	2
72	110
73	2
74	4
75	54
76	12
77	4
78	8
79	2
80	52
81	101
82	4
83	2
84	24
85	4
86	4
87	4

[1, 2, 2, 6, 2, 4, 2, 10, 11, 4, 2, 12, 2, 4, 4, 26, 2, 22, 2, 12, 4, 4, 2, 20, 27, 4, 20, 12, 2, 8, 2, 42, 4, 4, 4, 66, 2, 4, 4, 20, 2, 8, 2, 12, 22, 4, 2, 52, 51, 54, 4, 12, 2, 40, 4, 20, 4, 4, 2, 24, 2, 4, 22, 106, 4, 8, 2, 12, 4, 8, 2, 110, 2, 4, 54, 12, 4, 8, 2, 52, 101, 4, 2, 24, 4, 4, 4]

cp's OEIS Frontend

A068976 a(n) = Sum_{d | n} d/core(d) where core(x) is the smallest number such that x*core(x) is a square.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	4
7	2
8	10
9	11
10	4
11	2
12	12
13	2
14	4
15	4
16	26
17	2
18	22
19	2
20	12
21	4
22	4
23	2
24	20
25	27
26	4
27	20
28	12
29	2
30	8
31	2
32	42
33	4
34	4
35	4
36	66
37	2
38	4
39	4
40	20
41	2
42	8
43	2
44	12
45	22
46	4
47	2
48	52
49	51
50	54
51	4
52	12
53	2
54	40
55	4
56	20
57	4
58	4
59	2
60	24
61	2
62	4
63	22
64	106
65	4
66	8
67	2
68	12
69	4
70	8
71	2
72	110
73	2
74	4
75	54
76	12
77	4
78	8
79	2
80	52
81	101
82	4
83	2
84	24
85	4
86	4
87	4

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	4
7	2
8	10
9	11
10	4
11	2
12	12
13	2
14	4
15	4
16	26
17	2
18	22
19	2
20	12
21	4
22	4
23	2
24	20
25	27
26	4
27	20
28	12
29	2
30	8
31	2
32	42
33	4
34	4
35	4
36	66
37	2
38	4
39	4
40	20
41	2
42	8
43	2
44	12
45	22
46	4
47	2
48	52
49	51
50	54
51	4
52	12
53	2
54	40
55	4
56	20
57	4
58	4
59	2
60	24
61	2
62	4
63	22
64	106
65	4
66	8
67	2
68	12
69	4
70	8
71	2
72	110
73	2
74	4
75	54
76	12
77	4
78	8
79	2
80	52
81	101
82	4
83	2
84	24
85	4
86	4
87	4

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	4
7	2
8	10
9	11
10	4
11	2
12	12
13	2
14	4
15	4
16	26
17	2
18	22
19	2
20	12
21	4
22	4
23	2
24	20
25	27
26	4
27	20
28	12
29	2
30	8
31	2
32	42
33	4
34	4
35	4
36	66
37	2
38	4
39	4
40	20
41	2
42	8
43	2
44	12
45	22
46	4
47	2
48	52
49	51
50	54
51	4
52	12
53	2
54	40
55	4
56	20
57	4
58	4
59	2
60	24
61	2
62	4
63	22
64	106
65	4
66	8
67	2
68	12
69	4
70	8
71	2
72	110
73	2
74	4
75	54
76	12
77	4
78	8
79	2
80	52
81	101
82	4
83	2
84	24
85	4
86	4
87	4