A265708 - cp's OEIS frontend

A265708 a(n) = lcm_{d|n} sigma(d) * Sum_{d|n} 1/sigma(d), where sigma(d) represents the sum of divisors of d (A000203(d)).

n	a(n)
1	1
2	4
3	5
4	31
5	7
6	20
7	9
8	162
9	69
10	28
11	13
12	155
13	15
14	36
15	35
16	5127
17	19
18	276
19	21
20	217
21	45
22	52
23	25
24	810
25	223
26	60
27	703
28	279
29	31
30	140
31	33
32	15536
33	65
34	76
35	63
36	2139
37	39
38	84
39	75
40	1134
41	43
42	180
43	45
44	403
45	483
46	100
47	49
48	25635
49	521
50	892
51	95
52	465
53	55
54	2812
55	91
56	1458
57	105
58	124

[1, 4, 5, 31, 7, 20, 9, 162, 69, 28, 13, 155, 15, 36, 35, 5127, 19, 276, 21, 217, 45, 52, 25, 810, 223, 60, 703, 279, 31, 140, 33, 15536, 65, 76, 63, 2139, 39, 84, 75, 1134, 43, 180, 45, 403, 483, 100, 49, 25635, 521, 892, 95, 465, 55, 2812, 91, 1458, 105, 124]

cp's OEIS Frontend

A265708 a(n) = lcm_{d|n} sigma(d) * Sum_{d|n} 1/sigma(d), where sigma(d) represents the sum of divisors of d (A000203(d)).

Table of values

List of values