A099738 - cp's OEIS frontend

A099738 a(n) = 2*Sum_{k=1..n} (n+1-k) (Sum_{j|k} 1/floor(n/j)).

n	a(n)
1	2
2	5
3	10
4	15
5	24
6	30
7	43
8	52
9	66
10	78
11	99
12	107
13	132
14	150
15	171
16	188
17	221
18	236
19	273
20	291
21	322
22	352
23	397
24	409
25	453
26	489
27	530
28	558
29	615
30	633
31	694
32	727
33	778
34	826
35	883
36	900
37	973
38	1027
39	1088
40	1118
41	1199
42	1229
43	1314
44	1362
45	1419
46	1485
47	1578
48	1598
49	1688
50	1745
51	1826
52	1884

[2, 5, 10, 15, 24, 30, 43, 52, 66, 78, 99, 107, 132, 150, 171, 188, 221, 236, 273, 291, 322, 352, 397, 409, 453, 489, 530, 558, 615, 633, 694, 727, 778, 826, 883, 900, 973, 1027, 1088, 1118, 1199, 1229, 1314, 1362, 1419, 1485, 1578, 1598, 1688, 1745, 1826, 1884]

cp's OEIS Frontend

A099738 a(n) = 2*Sum_{k=1..n} (n+1-k) (Sum_{j|k} 1/floor(n/j)).

Table of values

List of values