A372833 - cp's OEIS frontend

A372833 a(n) is the denominator of Sum_{d|n, d <= sqrt(n)} 1/d.

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

[1, 1, 1, 2, 1, 2, 1, 2, 3, 2, 1, 6, 1, 2, 3, 4, 1, 6, 1, 4, 3, 2, 1, 12, 5, 2, 3, 4, 1, 30, 1, 4, 3, 2, 5, 4, 1, 2, 3, 20, 1, 1, 1, 4, 15, 2, 1, 4, 7, 10, 3, 4, 1, 1, 5, 28, 3, 2, 1, 20, 1, 2, 21, 8, 5, 1, 1, 4, 3, 70, 1, 8, 1, 2, 15, 4, 7, 1, 1, 40]

cp's OEIS Frontend

A372833 a(n) is the denominator of Sum_{d|n, d <= sqrt(n)} 1/d.

Table of values

List of values

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

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

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