A323155 - cp's OEIS frontend

A323155 a(n) = Product_{d|n, d-1 is prime} (d-1)^(1+A286561(n,d-1)), where A286561(n,k) gives the k-valuation of n (for k > 1).

n	a(n)
1	1
2	1
3	2
4	3
5	1
6	20
7	1
8	21
9	2
10	1
11	1
12	3960
13	1
14	13
15	2
16	21
17	1
18	340
19	1
20	57
21	2
22	1
23	1
24	1275120
25	1
26	1
27	2
28	39
29	1
30	2900
31	1
32	651
33	2
34	1
35	1
36	201960
37	1
38	37
39	2
40	399
41	1
42	10660
43	1
44	129
45	2
46	1
47	1
48	119861280
49	1
50	1
51	2
52	3
53	1
54	18020
55	1
56	1911
57	2
58	1
59	1
60	643678200
61	1
62	61
63	2
64	651
65	1
66	20
67	1
68	201
69	2
70	13
71	1
72	4617209520
73	1
74	73
75	2
76	111
77	1
78	20
79	1
80	31521
81	2
82	1
83	1
84	175186440
85	1
86	1
87	2
88	903
89	1

[1, 1, 2, 3, 1, 20, 1, 21, 2, 1, 1, 3960, 1, 13, 2, 21, 1, 340, 1, 57, 2, 1, 1, 1275120, 1, 1, 2, 39, 1, 2900, 1, 651, 2, 1, 1, 201960, 1, 37, 2, 399, 1, 10660, 1, 129, 2, 1, 1, 119861280, 1, 1, 2, 3, 1, 18020, 1, 1911, 2, 1, 1, 643678200, 1, 61, 2, 651, 1, 20, 1, 201, 2, 13, 1, 4617209520, 1, 73, 2, 111, 1, 20, 1, 31521, 2, 1, 1, 175186440, 1, 1, 2, 903, 1]

cp's OEIS Frontend

A323155 a(n) = Product_{d|n, d-1 is prime} (d-1)^(1+A286561(n,d-1)), where A286561(n,k) gives the k-valuation of n (for k > 1).

Table of values

List of values