A319210 - cp's OEIS frontend

A319210 a(n) = phi(n^2 - 1)/2 where phi is A000010.

n	a(n)
2	1
3	2
4	4
5	4
6	12
7	8
8	18
9	16
10	30
11	16
12	60
13	24
14	48
15	48
16	64
17	48
18	144
19	48
20	108
21	80
22	132
23	80
24	220
25	96
26	180
27	144
28	252
29	96
30	420
31	128
32	300
33	256
34	240
35	192
36	432
37	216
38	432
39	288
40	480
41	192
42	840
43	240
44	504
45	440
46	552
47	352
48	966
49	320
50	672
51	480
52	832
53	432
54	1040
55	432
56	720
57	672
58	1044
59	448

[1, 2, 4, 4, 12, 8, 18, 16, 30, 16, 60, 24, 48, 48, 64, 48, 144, 48, 108, 80, 132, 80, 220, 96, 180, 144, 252, 96, 420, 128, 300, 256, 240, 192, 432, 216, 432, 288, 480, 192, 840, 240, 504, 440, 552, 352, 966, 320, 672, 480, 832, 432, 1040, 432, 720, 672, 1044, 448]

cp's OEIS Frontend

A319210 a(n) = phi(n^2 - 1)/2 where phi is A000010.

Table of values

List of values