A232210 - cp's OEIS frontend

A232210 Let b_k=3...3 consist of k>=1 3's. Then a(n) is the smallest k such that the concatenation prime(n)b_k is prime, or a(n)=0 if there is no such prime.

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

[1, 0, 1, 1, 1, 14, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 3, 1, 2, 6, 2, 2, 1, 1, 2, 1, 4, 4, 23, 1, 2, 1, 6, 2, 2, 5, 1, 10, 2, 1, 1, 1, 1, 1, 6, 1, 1, 1, 1, 2, 4, 2, 1, 1, 1, 2, 4, 1, 2, 5, 4, 2, 3, 1, 1, 5, 4, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 6, 4, 2, 14, 2, 4, 1, 3]

cp's OEIS Frontend

A232210 Let b_k=3...3 consist of k>=1 3's. Then a(n) is the smallest k such that the concatenation prime(n)b_k is prime, or a(n)=0 if there is no such prime.

Table of values

List of values

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

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

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