A353767 - cp's OEIS frontend

A353767 a(n) = phi(sigma(A003961(n))), where A003961 is fully multiplicative with a(p) = nextprime(p).

n	a(n)
1	1
2	2
3	2
4	12
5	4
6	8
7	4
8	16
9	30
10	16
11	6
12	24
13	6
14	16
15	16
16	110
17	8
18	60
19	8
20	48
21	24
22	24
23	8
24	64
25	36
26	24
27	48
28	48
29	16
30	64
31	18
32	144
33	24
34	32
35	32
36	360
37	12
38	32
39	36
40	128
41	20
42	96
43	16
44	72
45	120
46	32
47	18
48	220
49	108
50	72
51	32
52	72
53	16
54	192
55	48
56	128
57	48
58	64
59	30
60	192
61	32
62	72
63	120
64	1092
65	48
66	96
67	24
68	96
69	48
70	128
71	36
72	480
73	32
74	48
75	108
76	96
77	48
78	144

[1, 2, 2, 12, 4, 8, 4, 16, 30, 16, 6, 24, 6, 16, 16, 110, 8, 60, 8, 48, 24, 24, 8, 64, 36, 24, 48, 48, 16, 64, 18, 144, 24, 32, 32, 360, 12, 32, 36, 128, 20, 96, 16, 72, 120, 32, 18, 220, 108, 72, 32, 72, 16, 192, 48, 128, 48, 64, 30, 192, 32, 72, 120, 1092, 48, 96, 24, 96, 48, 128, 36, 480, 32, 48, 108, 96, 48, 144]

cp's OEIS Frontend

A353767 a(n) = phi(sigma(A003961(n))), where A003961 is fully multiplicative with a(p) = nextprime(p).

Table of values

List of values