A077101 - cp's OEIS frontend

A077101 a(n) = A051612(n)*A065387(n) = sigma(n)^2-phi(n)^2, where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

n	a(n)
1	0
2	8
3	12
4	45
5	20
6	140
7	28
8	209
9	133
10	308
11	44
12	768
13	52
14	540
15	512
16	897
17	68
18	1485
19	76
20	1700
21	880
22	1196
23	92
24	3536
25	561
26	1620
27	1276
28	2992
29	116
30	5120
31	124
32	3713
33	1904
34	2660
35	1728
36	8137
37	148
38	3276
39	2560
40	7844
41	164
42	9072
43	172
44	6656
45	5508
46	4700
47	188
48	15120
49	1485

[0, 8, 12, 45, 20, 140, 28, 209, 133, 308, 44, 768, 52, 540, 512, 897, 68, 1485, 76, 1700, 880, 1196, 92, 3536, 561, 1620, 1276, 2992, 116, 5120, 124, 3713, 1904, 2660, 1728, 8137, 148, 3276, 2560, 7844, 164, 9072, 172, 6656, 5508, 4700, 188, 15120, 1485]

cp's OEIS Frontend

A077101 a(n) = A051612(n)*A065387(n) = sigma(n)^2-phi(n)^2, where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

Table of values

List of values