A241425 - cp's OEIS frontend

A241425 Largest number k > 0 such that n + k! and n - k! are both prime, or 0 if no such k exists.

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	1
7	0
8	0
9	2
10	0
11	3
12	1
13	3
14	0
15	2
16	0
17	3
18	1
19	0
20	0
21	2
22	0
23	3
24	0
25	3
26	0
27	0
28	0
29	4
30	1
31	0
32	0
33	0
34	0
35	4
36	0
37	4
38	0
39	2
40	0
41	0
42	1
43	4
44	0
45	2
46	0
47	4
48	0
49	0
50	0
51	0
52	0
53	3
54	0
55	4
56	0
57	0
58	0
59	0
60	1
61	0
62	0
63	0
64	0
65	4
66	0
67	3
68	0
69	2
70	0
71	0
72	1
73	3
74	0
75	0
76	0
77	4
78	0
79	0
80	0
81	2
82	0
83	4
84	0
85	4
86	0
87	0
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	3

[0, 0, 0, 1, 2, 1, 0, 0, 2, 0, 3, 1, 3, 0, 2, 0, 3, 1, 0, 0, 2, 0, 3, 0, 3, 0, 0, 0, 4, 1, 0, 0, 0, 0, 4, 0, 4, 0, 2, 0, 0, 1, 4, 0, 2, 0, 4, 0, 0, 0, 0, 0, 3, 0, 4, 0, 0, 0, 0, 1, 0, 0, 0, 0, 4, 0, 3, 0, 2, 0, 0, 1, 3, 0, 0, 0, 4, 0, 0, 0, 2, 0, 4, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3]

cp's OEIS Frontend

A241425 Largest number k > 0 such that n + k! and n - k! are both prime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	1
7	0
8	0
9	2
10	0
11	3
12	1
13	3
14	0
15	2
16	0
17	3
18	1
19	0
20	0
21	2
22	0
23	3
24	0
25	3
26	0
27	0
28	0
29	4
30	1
31	0
32	0
33	0
34	0
35	4
36	0
37	4
38	0
39	2
40	0
41	0
42	1
43	4
44	0
45	2
46	0
47	4
48	0
49	0
50	0
51	0
52	0
53	3
54	0
55	4
56	0
57	0
58	0
59	0
60	1
61	0
62	0
63	0
64	0
65	4
66	0
67	3
68	0
69	2
70	0
71	0
72	1
73	3
74	0
75	0
76	0
77	4
78	0
79	0
80	0
81	2
82	0
83	4
84	0
85	4
86	0
87	0
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	3

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	1
7	0
8	0
9	2
10	0
11	3
12	1
13	3
14	0
15	2
16	0
17	3
18	1
19	0
20	0
21	2
22	0
23	3
24	0
25	3
26	0
27	0
28	0
29	4
30	1
31	0
32	0
33	0
34	0
35	4
36	0
37	4
38	0
39	2
40	0
41	0
42	1
43	4
44	0
45	2
46	0
47	4
48	0
49	0
50	0
51	0
52	0
53	3
54	0
55	4
56	0
57	0
58	0
59	0
60	1
61	0
62	0
63	0
64	0
65	4
66	0
67	3
68	0
69	2
70	0
71	0
72	1
73	3
74	0
75	0
76	0
77	4
78	0
79	0
80	0
81	2
82	0
83	4
84	0
85	4
86	0
87	0
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	3

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	1
7	0
8	0
9	2
10	0
11	3
12	1
13	3
14	0
15	2
16	0
17	3
18	1
19	0
20	0
21	2
22	0
23	3
24	0
25	3
26	0
27	0
28	0
29	4
30	1
31	0
32	0
33	0
34	0
35	4
36	0
37	4
38	0
39	2
40	0
41	0
42	1
43	4
44	0
45	2
46	0
47	4
48	0
49	0
50	0
51	0
52	0
53	3
54	0
55	4
56	0
57	0
58	0
59	0
60	1
61	0
62	0
63	0
64	0
65	4
66	0
67	3
68	0
69	2
70	0
71	0
72	1
73	3
74	0
75	0
76	0
77	4
78	0
79	0
80	0
81	2
82	0
83	4
84	0
85	4
86	0
87	0
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	3