A066065 - cp's OEIS frontend

A066065 a(n) = smallest prime q such that in decimal notation the concatenation prime(n)q yields a prime ( = A066064(n)).

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

[3, 7, 3, 3, 3, 7, 3, 3, 3, 3, 3, 3, 11, 3, 23, 23, 3, 3, 3, 29, 3, 7, 11, 23, 7, 3, 3, 11, 3, 11, 7, 47, 3, 13, 3, 31, 31, 7, 29, 3, 11, 19, 3, 3, 3, 3, 3, 7, 3, 3, 3, 3, 7, 11, 17, 3, 3, 3, 7, 11, 3, 11, 13, 23, 7, 23, 3, 3, 29, 13, 3, 3, 3, 3, 3, 3, 17, 19, 3, 3, 11, 7, 17, 7, 7, 71, 3, 37, 41]

cp's OEIS Frontend

A066065 a(n) = smallest prime q such that in decimal notation the concatenation prime(n)q yields a prime ( = A066064(n)).

Table of values

List of values

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

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

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