A305400 - cp's OEIS frontend

A305400 a(n) = round(1/(A073918(n)/prime(n)# - 1)), where A073918(n) = min { prime p | omega(p-1) = n } and p# = product of primes <= p.

n	a(n)
0	1
1	2
2	6
3	30
4	210
5	2310
6	2
7	1
8	3
9	3
10	14
11	200560490130
12	2
13	4
14	2
15	8
16	7
17	2
18	2
19	2
20	4
21	9
22	7
23	3
24	2
25	5
26	7
27	4
28	13
29	27
30	2
31	3
32	3
33	10
34	3
35	8
36	9
37	4
38	41
39	7
40	4
41	5
42	7
43	32
44	5
45	32
46	6
47	5
48	7
49	11
50	7
51	4
52	5
53	13
54	5
55	21
56	10
57	19
58	27
59	8
60	7
61	3
62	6
63	51
64	15
65	10
66	10
67	15
68	8
69	21
70	17
71	29

[1, 2, 6, 30, 210, 2310, 2, 1, 3, 3, 14, 200560490130, 2, 4, 2, 8, 7, 2, 2, 2, 4, 9, 7, 3, 2, 5, 7, 4, 13, 27, 2, 3, 3, 10, 3, 8, 9, 4, 41, 7, 4, 5, 7, 32, 5, 32, 6, 5, 7, 11, 7, 4, 5, 13, 5, 21, 10, 19, 27, 8, 7, 3, 6, 51, 15, 10, 10, 15, 8, 21, 17, 29]

cp's OEIS Frontend

A305400 a(n) = round(1/(A073918(n)/prime(n)# - 1)), where A073918(n) = min { prime p | omega(p-1) = n } and p# = product of primes <= p.

Table of values

List of values