A064027 - cp's OEIS frontend

A064027 a(n) = (-1)^nSum_{d|n} (-1)^dd^2.

n	a(n)
1	1
2	3
3	10
4	19
5	26
6	30
7	50
8	83
9	91
10	78
11	122
12	190
13	170
14	150
15	260
16	339
17	290
18	273
19	362
20	494
21	500
22	366
23	530
24	830
25	651
26	510
27	820
28	950
29	842
30	780
31	962
32	1363
33	1220
34	870
35	1300
36	1729
37	1370
38	1086
39	1700
40	2158
41	1682
42	1500
43	1850
44	2318
45	2366
46	1590
47	2210
48	3390
49	2451
50	1953

[1, 3, 10, 19, 26, 30, 50, 83, 91, 78, 122, 190, 170, 150, 260, 339, 290, 273, 362, 494, 500, 366, 530, 830, 651, 510, 820, 950, 842, 780, 962, 1363, 1220, 870, 1300, 1729, 1370, 1086, 1700, 2158, 1682, 1500, 1850, 2318, 2366, 1590, 2210, 3390, 2451, 1953]

cp's OEIS Frontend

A064027 a(n) = (-1)^nSum_{d|n} (-1)^dd^2.

Table of values

List of values

cp's OEIS Frontend

A064027 a(n) = (-1)^n*Sum_{d|n} (-1)^d*d^2.

Table of values

List of values

A064027 a(n) = (-1)^nSum_{d|n} (-1)^dd^2.