A007920 - cp's OEIS frontend

A007920 Smallest number k such that n + k is prime.

n	a(n)
0	2
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	2
10	1
11	0
12	1
13	0
14	3
15	2
16	1
17	0
18	1
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	3
27	2
28	1
29	0
30	1
31	0
32	5
33	4
34	3
35	2
36	1
37	0
38	3
39	2
40	1
41	0
42	1
43	0
44	3
45	2
46	1
47	0
48	5
49	4
50	3
51	2
52	1
53	0
54	5
55	4
56	3
57	2
58	1
59	0
60	1
61	0
62	5
63	4
64	3
65	2
66	1
67	0
68	3
69	2
70	1
71	0
72	1
73	0
74	5
75	4
76	3
77	2
78	1
79	0
80	3
81	2
82	1
83	0
84	5
85	4
86	3
87	2
88	1
89	0
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	0
98	3
99	2
100	1
101	0
102	1
103	0
104	3
105	2
106	1
107	0
108	1

[2, 1, 0, 0, 1, 0, 1, 0, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 1, 0, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 1, 0, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 1, 0, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 1]

cp's OEIS Frontend

A007920 Smallest number k such that n + k is prime.

Table of values

List of values

n	a(n)
0	2
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	2
10	1
11	0
12	1
13	0
14	3
15	2
16	1
17	0
18	1
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	3
27	2
28	1
29	0
30	1
31	0
32	5
33	4
34	3
35	2
36	1
37	0
38	3
39	2
40	1
41	0
42	1
43	0
44	3
45	2
46	1
47	0
48	5
49	4
50	3
51	2
52	1
53	0
54	5
55	4
56	3
57	2
58	1
59	0
60	1
61	0
62	5
63	4
64	3
65	2
66	1
67	0
68	3
69	2
70	1
71	0
72	1
73	0
74	5
75	4
76	3
77	2
78	1
79	0
80	3
81	2
82	1
83	0
84	5
85	4
86	3
87	2
88	1
89	0
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	0
98	3
99	2
100	1
101	0
102	1
103	0
104	3
105	2
106	1
107	0
108	1

n	a(n)
0	2
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	2
10	1
11	0
12	1
13	0
14	3
15	2
16	1
17	0
18	1
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	3
27	2
28	1
29	0
30	1
31	0
32	5
33	4
34	3
35	2
36	1
37	0
38	3
39	2
40	1
41	0
42	1
43	0
44	3
45	2
46	1
47	0
48	5
49	4
50	3
51	2
52	1
53	0
54	5
55	4
56	3
57	2
58	1
59	0
60	1
61	0
62	5
63	4
64	3
65	2
66	1
67	0
68	3
69	2
70	1
71	0
72	1
73	0
74	5
75	4
76	3
77	2
78	1
79	0
80	3
81	2
82	1
83	0
84	5
85	4
86	3
87	2
88	1
89	0
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	0
98	3
99	2
100	1
101	0
102	1
103	0
104	3
105	2
106	1
107	0
108	1

n	a(n)
0	2
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	2
10	1
11	0
12	1
13	0
14	3
15	2
16	1
17	0
18	1
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	3
27	2
28	1
29	0
30	1
31	0
32	5
33	4
34	3
35	2
36	1
37	0
38	3
39	2
40	1
41	0
42	1
43	0
44	3
45	2
46	1
47	0
48	5
49	4
50	3
51	2
52	1
53	0
54	5
55	4
56	3
57	2
58	1
59	0
60	1
61	0
62	5
63	4
64	3
65	2
66	1
67	0
68	3
69	2
70	1
71	0
72	1
73	0
74	5
75	4
76	3
77	2
78	1
79	0
80	3
81	2
82	1
83	0
84	5
85	4
86	3
87	2
88	1
89	0
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	0
98	3
99	2
100	1
101	0
102	1
103	0
104	3
105	2
106	1
107	0
108	1