A321281 - cp's OEIS frontend

A321281 a(n) is the number of primes of the form p*10^n + q, where p, q are the digits from 1 to 9.

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

[21, 15, 13, 8, 9, 5, 3, 8, 8, 2, 2, 3, 2, 0, 2, 2, 2, 3, 2, 5, 1, 4, 0, 3, 1, 1, 1, 2, 2, 0, 2, 0, 0, 0, 2, 2, 1, 1, 3, 1, 0, 2, 0, 0, 3, 2, 0, 0, 1, 0, 0, 1, 1, 0, 1, 2, 2, 1, 0, 2, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1]

cp's OEIS Frontend

A321281 a(n) is the number of primes of the form p*10^n + q, where p, q are the digits from 1 to 9.

Table of values

List of values

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

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

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