A081239 - cp's OEIS frontend

A081239 #{(i,j): mu(i)*mu(j) = 0, 1<=i,j<=n}, where mu=A008683 (Moebius function).

n	a(n)
1	0
2	0
3	0
4	7
5	9
6	11
7	13
8	28
9	45
10	51
11	57
12	80
13	88
14	96
15	104
16	135
17	145
18	180
19	192
20	231
21	245
22	259
23	273
24	320
25	369
26	387
27	440
28	495
29	517
30	539
31	561
32	624
33	648
34	672
35	696
36	767
37	793
38	819
39	845
40	924
41	952
42	980
43	1008
44	1095
45	1184
46	1216
47	1248
48	1343
49	1440
50	1539
51	1577
52	1680
53	1720

[0, 0, 0, 7, 9, 11, 13, 28, 45, 51, 57, 80, 88, 96, 104, 135, 145, 180, 192, 231, 245, 259, 273, 320, 369, 387, 440, 495, 517, 539, 561, 624, 648, 672, 696, 767, 793, 819, 845, 924, 952, 980, 1008, 1095, 1184, 1216, 1248, 1343, 1440, 1539, 1577, 1680, 1720]

cp's OEIS Frontend

A081239 #{(i,j): mu(i)*mu(j) = 0, 1<=i,j<=n}, where mu=A008683 (Moebius function).

Table of values

List of values