A175194 - cp's OEIS frontend

A175194 a(n) = the smallest factorial such that (the n-th prime)+a(n) is prime, or -1 if no such prime exists.

n	a(n)
1	1
2	2
3	2
4	6
5	2
6	6
7	2
8	24
9	6
10	2
11	6
12	6
13	2
14	24
15	6
16	6
17	2
18	6
19	6
20	2
21	6
22	24
23	6
24	24
25	6
26	2
27	6
28	2
29	120
30	24
31	24
32	6
33	2
34	24
35	2
36	6
37	6
38	120
39	6
40	6
41	2
42	362880
43	2
44	6
45	2
46	24
47	120
48	6
49	2
50	120
51	6
52	2
53	5040
54	6
55	6
56	6
57	2
58	6
59	6
60	2
61	24
62	24
63	6
64	2
65	24
66	40320
67	6
68	120
69	2
70	24
71	6
72	24
73	6
74	6
75	120
76	6
77	120
78	24
79	120
80	24
81	2
82	120
83	2

[1, 2, 2, 6, 2, 6, 2, 24, 6, 2, 6, 6, 2, 24, 6, 6, 2, 6, 6, 2, 6, 24, 6, 24, 6, 2, 6, 2, 120, 24, 24, 6, 2, 24, 2, 6, 6, 120, 6, 6, 2, 362880, 2, 6, 2, 24, 120, 6, 2, 120, 6, 2, 5040, 6, 6, 6, 2, 6, 6, 2, 24, 24, 6, 2, 24, 40320, 6, 120, 2, 24, 6, 24, 6, 6, 120, 6, 120, 24, 120, 24, 2, 120, 2]

cp's OEIS Frontend

A175194 a(n) = the smallest factorial such that (the n-th prime)+a(n) is prime, or -1 if no such prime exists.

Table of values

List of values