A356741 - cp's OEIS frontend

A356741 a(n) is the least prime(m) such that prime(n) + prime(m)# is prime, where prime(m)# denotes the product of the first m primes, or -1 if no such prime(m) exists.

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

[2, 2, 3, 2, 3, 2, 7, 3, 2, 3, 3, 2, 5, 3, 3, 2, 3, 3, 2, 3, 5, 3, 11, 3, 2, 3, 2, 5, 11, 5, 3, 2, 7, 2, 3, 3, 5, 3, 3, 2, 5, 2, 3, 2, 5, 5, 3, 2, 7, 3, 2, 5, 3, 3, 3, 2, 3, 3, 2, 5, 7, 3, 2, 7, 5, 3, 5, 2, 5, 3, 5, 3, 3, 5, 3, 5, 7, 5, 5, 2, 7, 2, 3, 11, 3, 5, 3]

cp's OEIS Frontend

A356741 a(n) is the least prime(m) such that prime(n) + prime(m)# is prime, where prime(m)# denotes the product of the first m primes, or -1 if no such prime(m) exists.

Table of values

List of values

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

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

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