A133725 - cp's OEIS frontend

A133725 a(n) = Sum_{d|n} mu(n/d)d(3*d - 1)/2.

n	a(n)
1	1
2	4
3	11
4	17
5	34
6	35
7	69
8	70
9	105
10	106
11	175
12	142
13	246
14	213
15	284
16	284
17	424
18	321
19	531
20	428
21	570
22	535
23	781
24	572
25	890
26	750
27	963
28	858
29	1246
30	860
31	1425
32	1144
33	1430
34	1288
35	1716
36	1290
37	2034
38	1611
39	2004
40	1720
41	2500
42	1722
43	2751
44	2150
45	2580
46	2365
47	3289
48	2296
49	3507
50	2690

[1, 4, 11, 17, 34, 35, 69, 70, 105, 106, 175, 142, 246, 213, 284, 284, 424, 321, 531, 428, 570, 535, 781, 572, 890, 750, 963, 858, 1246, 860, 1425, 1144, 1430, 1288, 1716, 1290, 2034, 1611, 2004, 1720, 2500, 1722, 2751, 2150, 2580, 2365, 3289, 2296, 3507, 2690]

cp's OEIS Frontend

A133725 a(n) = Sum_{d|n} mu(n/d)d(3*d - 1)/2.

Table of values

List of values

cp's OEIS Frontend

A133725 a(n) = Sum_{d|n} mu(n/d)*d*(3*d - 1)/2.

Table of values

List of values

A133725 a(n) = Sum_{d|n} mu(n/d)d(3*d - 1)/2.