A032662 - cp's OEIS frontend

A032662 a(n) is the least k such that k concatenated with k + n is prime.

n	a(n)
0	1
1	2
2	1
3	4
4	3
5	12
6	1
7	2
8	1
9	2
10	3
11	6
12	1
13	6
14	3
15	4
16	5
17	4
18	5
19	8
20	7
21	2
22	21
23	10
24	17
25	2
26	1
27	2
28	3
29	4
30	1
31	2
32	7
33	14
34	3
35	4
36	1
37	2
38	1
39	2
40	11
41	6
42	5
43	18
44	3
45	4
46	3
47	6
48	1
49	2
50	1
51	8
52	5
53	4
54	7
55	2
56	1
57	4
58	5
59	4
60	11
61	2
62	1
63	4
64	3
65	12
66	1
67	2
68	9
69	2
70	3
71	6
72	1
73	8
74	9
75	2
76	3
77	6
78	1
79	2
80	1
81	2
82	5
83	4
84	929
85	6
86	3
87	4
88	5
89	12
90	1
91	2
92	1

[1, 2, 1, 4, 3, 12, 1, 2, 1, 2, 3, 6, 1, 6, 3, 4, 5, 4, 5, 8, 7, 2, 21, 10, 17, 2, 1, 2, 3, 4, 1, 2, 7, 14, 3, 4, 1, 2, 1, 2, 11, 6, 5, 18, 3, 4, 3, 6, 1, 2, 1, 8, 5, 4, 7, 2, 1, 4, 5, 4, 11, 2, 1, 4, 3, 12, 1, 2, 9, 2, 3, 6, 1, 8, 9, 2, 3, 6, 1, 2, 1, 2, 5, 4, 929, 6, 3, 4, 5, 12, 1, 2, 1]

cp's OEIS Frontend

A032662 a(n) is the least k such that k concatenated with k + n is prime.

Table of values

List of values

n	a(n)
0	1
1	2
2	1
3	4
4	3
5	12
6	1
7	2
8	1
9	2
10	3
11	6
12	1
13	6
14	3
15	4
16	5
17	4
18	5
19	8
20	7
21	2
22	21
23	10
24	17
25	2
26	1
27	2
28	3
29	4
30	1
31	2
32	7
33	14
34	3
35	4
36	1
37	2
38	1
39	2
40	11
41	6
42	5
43	18
44	3
45	4
46	3
47	6
48	1
49	2
50	1
51	8
52	5
53	4
54	7
55	2
56	1
57	4
58	5
59	4
60	11
61	2
62	1
63	4
64	3
65	12
66	1
67	2
68	9
69	2
70	3
71	6
72	1
73	8
74	9
75	2
76	3
77	6
78	1
79	2
80	1
81	2
82	5
83	4
84	929
85	6
86	3
87	4
88	5
89	12
90	1
91	2
92	1

n	a(n)
0	1
1	2
2	1
3	4
4	3
5	12
6	1
7	2
8	1
9	2
10	3
11	6
12	1
13	6
14	3
15	4
16	5
17	4
18	5
19	8
20	7
21	2
22	21
23	10
24	17
25	2
26	1
27	2
28	3
29	4
30	1
31	2
32	7
33	14
34	3
35	4
36	1
37	2
38	1
39	2
40	11
41	6
42	5
43	18
44	3
45	4
46	3
47	6
48	1
49	2
50	1
51	8
52	5
53	4
54	7
55	2
56	1
57	4
58	5
59	4
60	11
61	2
62	1
63	4
64	3
65	12
66	1
67	2
68	9
69	2
70	3
71	6
72	1
73	8
74	9
75	2
76	3
77	6
78	1
79	2
80	1
81	2
82	5
83	4
84	929
85	6
86	3
87	4
88	5
89	12
90	1
91	2
92	1

n	a(n)
0	1
1	2
2	1
3	4
4	3
5	12
6	1
7	2
8	1
9	2
10	3
11	6
12	1
13	6
14	3
15	4
16	5
17	4
18	5
19	8
20	7
21	2
22	21
23	10
24	17
25	2
26	1
27	2
28	3
29	4
30	1
31	2
32	7
33	14
34	3
35	4
36	1
37	2
38	1
39	2
40	11
41	6
42	5
43	18
44	3
45	4
46	3
47	6
48	1
49	2
50	1
51	8
52	5
53	4
54	7
55	2
56	1
57	4
58	5
59	4
60	11
61	2
62	1
63	4
64	3
65	12
66	1
67	2
68	9
69	2
70	3
71	6
72	1
73	8
74	9
75	2
76	3
77	6
78	1
79	2
80	1
81	2
82	5
83	4
84	929
85	6
86	3
87	4
88	5
89	12
90	1
91	2
92	1