A057661 - cp's OEIS frontend

A057661 a(n) = Sum_{k=1..n} lcm(n,k)/n.

n	a(n)
1	1
2	2
3	4
4	6
5	11
6	11
7	22
8	22
9	31
10	32
11	56
12	39
13	79
14	65
15	74
16	86
17	137
18	92
19	172
20	116
21	151
22	167
23	254
24	151
25	261
26	236
27	274
28	237
29	407
30	221
31	466
32	342
33	389
34	410
35	452
36	336
37	667
38	515
39	550
40	452
41	821
42	452
43	904
44	611
45	641
46	761
47	1082
48	599
49	1051
50	782
51	956
52	864
53	1379
54	821
55	1166

[1, 2, 4, 6, 11, 11, 22, 22, 31, 32, 56, 39, 79, 65, 74, 86, 137, 92, 172, 116, 151, 167, 254, 151, 261, 236, 274, 237, 407, 221, 466, 342, 389, 410, 452, 336, 667, 515, 550, 452, 821, 452, 904, 611, 641, 761, 1082, 599, 1051, 782, 956, 864, 1379, 821, 1166]

cp's OEIS Frontend

A057661 a(n) = Sum_{k=1..n} lcm(n,k)/n.

Table of values

List of values