A366937 - cp's OEIS frontend

A366937 a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(k+1,2) * floor(n/k).

n	a(n)
1	1
2	-1
3	6
4	-6
5	10
6	-7
7	22
8	-26
9	26
10	-16
11	51
12	-54
13	38
14	-41
15	101
16	-83
17	71
18	-72
19	119
20	-143
21	123
22	-66
23	211
24	-230
25	111
26	-151
27	279
28	-216
29	220
30	-182
31	315
32	-397
33	237
34	-207
35	467
36	-430
37	274
38	-279
39	599
40	-519
41	343
42	-423
43	524
44	-665
45	557
46	-250
47	879
48	-874
49	380
50	-612
51	874
52	-776

[1, -1, 6, -6, 10, -7, 22, -26, 26, -16, 51, -54, 38, -41, 101, -83, 71, -72, 119, -143, 123, -66, 211, -230, 111, -151, 279, -216, 220, -182, 315, -397, 237, -207, 467, -430, 274, -279, 599, -519, 343, -423, 524, -665, 557, -250, 879, -874, 380, -612, 874, -776]

cp's OEIS Frontend

A366937 a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(k+1,2) * floor(n/k).

Table of values

List of values