A265390 - cp's OEIS frontend

A265390 a(n) = lcm_{d|n} tau(d) * Sum_{d|n} 1/tau(d), where tau(d) represents the number of divisors of d (A000005(d)).

n	a(n)
1	1
2	3
3	3
4	11
5	3
6	9
7	3
8	25
9	11
10	9
11	3
12	33
13	3
14	9
15	9
16	137
17	3
18	33
19	3
20	33
21	9
22	9
23	3
24	75
25	11
26	9
27	25
28	33
29	3
30	27
31	3
32	147
33	9
34	9
35	9
36	121
37	3
38	9
39	9
40	75
41	3
42	27
43	3
44	33
45	33
46	9
47	3
48	411
49	11
50	33
51	9
52	33
53	3
54	75
55	9
56	75
57	9
58	9
59	3
60	99
61	3
62	9
63	33
64	1089
65	9
66	27
67	3
68	33
69	9
70	27
71	3
72	275
73	3
74	9
75	33
76	33
77	9
78	27
79	3
80	411
81	137
82	9
83	3
84	99
85	9
86	9
87	9
88	75
89	3
90	99
91	9
92	33

[1, 3, 3, 11, 3, 9, 3, 25, 11, 9, 3, 33, 3, 9, 9, 137, 3, 33, 3, 33, 9, 9, 3, 75, 11, 9, 25, 33, 3, 27, 3, 147, 9, 9, 9, 121, 3, 9, 9, 75, 3, 27, 3, 33, 33, 9, 3, 411, 11, 33, 9, 33, 3, 75, 9, 75, 9, 9, 3, 99, 3, 9, 33, 1089, 9, 27, 3, 33, 9, 27, 3, 275, 3, 9, 33, 33, 9, 27, 3, 411, 137, 9, 3, 99, 9, 9, 9, 75, 3, 99, 9, 33]

cp's OEIS Frontend

A265390 a(n) = lcm_{d|n} tau(d) * Sum_{d|n} 1/tau(d), where tau(d) represents the number of divisors of d (A000005(d)).

Table of values

List of values