A305984 - cp's OEIS frontend

A305984 a(n) = Product_{d|n, d>1} prime(A305793(1+d)-1), where A305973(k) records the prime signature of 2k-1.

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	8
7	5
8	12
9	4
10	20
11	2
12	72
13	7
14	20
15	8
16	60
17	5
18	32
19	5
20	120
21	20
22	44
23	2
24	432
25	10
26	28
27	20
28	300
29	2
30	320
31	11
32	300
33	8
34	50
35	20
36	576
37	11
38	50
39	28
40	3120
41	2
42	800
43	5
44	264
45	80
46	20
47	5
48	4320
49	55
50	200
51	20
52	1428
53	2
54	320
55	20
56	1200
57	50
58	44
59	5
60	17280
61	5
62	154
63	80
64	1500
65	28
66	1760
67	19
68	300
69	8
70	2000
71	5
72	17280
73	11
74	44
75	80
76	1650
77	50
78	448
79	5
80	78000
81	40
82	68
83	2

[1, 2, 2, 6, 2, 8, 5, 12, 4, 20, 2, 72, 7, 20, 8, 60, 5, 32, 5, 120, 20, 44, 2, 432, 10, 28, 20, 300, 2, 320, 11, 300, 8, 50, 20, 576, 11, 50, 28, 3120, 2, 800, 5, 264, 80, 20, 5, 4320, 55, 200, 20, 1428, 2, 320, 20, 1200, 50, 44, 5, 17280, 5, 154, 80, 1500, 28, 1760, 19, 300, 8, 2000, 5, 17280, 11, 44, 80, 1650, 50, 448, 5, 78000, 40, 68, 2]

cp's OEIS Frontend

A305984 a(n) = Product_{d|n, d>1} prime(A305793(1+d)-1), where A305973(k) records the prime signature of 2k-1.

Table of values

List of values