A338991 - cp's OEIS frontend

A338991 a(n) = Sum_{k=1..floor(n/2)} (n-2k) floor((n-k)/k).

n	a(n)
1	0
2	0
3	2
4	6
5	13
6	24
7	37
8	56
9	78
10	106
11	132
12	178
13	212
14	258
15	312
16	376
17	425
18	508
19	565
20	662
21	749
22	836
23	909
24	1058
25	1156
26	1264
27	1384
28	1536
29	1636
30	1836
31	1946
32	2126
33	2282
34	2434
35	2606
36	2880
37	3019
38	3194
39	3385
40	3676
41	3833
42	4138
43	4305
44	4572
45	4863
46	5086
47	5271
48	5692
49	5924
50	6240

[0, 0, 2, 6, 13, 24, 37, 56, 78, 106, 132, 178, 212, 258, 312, 376, 425, 508, 565, 662, 749, 836, 909, 1058, 1156, 1264, 1384, 1536, 1636, 1836, 1946, 2126, 2282, 2434, 2606, 2880, 3019, 3194, 3385, 3676, 3833, 4138, 4305, 4572, 4863, 5086, 5271, 5692, 5924, 6240]

cp's OEIS Frontend

A338991 a(n) = Sum_{k=1..floor(n/2)} (n-2k) floor((n-k)/k).

Table of values

List of values

cp's OEIS Frontend

A338991 a(n) = Sum_{k=1..floor(n/2)} (n-2*k) * floor((n-k)/k).

Table of values

List of values

A338991 a(n) = Sum_{k=1..floor(n/2)} (n-2k) floor((n-k)/k).