A353750 - cp's OEIS frontend

A353750 a(n) = phi(sigma(n)) * A064989(sigma(n)), where A064989 shifts the prime factorization one step towards lower primes.

n	a(n)
1	1
2	4
3	2
4	30
5	4
6	8
7	4
8	48
9	132
10	24
11	8
12	60
13	30
14	16
15	16
16	870
17	24
18	528
19	24
20	120
21	16
22	48
23	16
24	96
25	870
26	120
27	48
28	120
29	48
30	96
31	16
32	720
33	32
34	144
35	32
36	3960
37	306
38	96
39	120
40	288
41	120
42	64
43	140
44	240
45	528
46	96
47	32
48	1740
49	1224
50	3480
51	96
52	1050
53	144
54	192
55	96
56	192
57	96
58	288
59	96
60	480
61	870
62	64
63	528
64	14238
65	240
66	192
67	416
68	720
69	64
70	192
71	96

[1, 4, 2, 30, 4, 8, 4, 48, 132, 24, 8, 60, 30, 16, 16, 870, 24, 528, 24, 120, 16, 48, 16, 96, 870, 120, 48, 120, 48, 96, 16, 720, 32, 144, 32, 3960, 306, 96, 120, 288, 120, 64, 140, 240, 528, 96, 32, 1740, 1224, 3480, 96, 1050, 144, 192, 96, 192, 96, 288, 96, 480, 870, 64, 528, 14238, 240, 192, 416, 720, 64, 192, 96]

cp's OEIS Frontend

A353750 a(n) = phi(sigma(n)) * A064989(sigma(n)), where A064989 shifts the prime factorization one step towards lower primes.

Table of values

List of values