A290174 - cp's OEIS frontend

A290174 Maximal number of zeros that can be inserted one-by-one between the digits of prime(n) such that the number resulting from each step remains prime.

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

[0, 0, 0, 0, 1, 1, 1, 3, 0, 0, 0, 1, 2, 0, 0, 2, 2, 1, 2, 4, 0, 1, 0, 2, 4, 0, 0, 0, 2, 4, 0, 7, 3, 2, 3, 3, 0, 1, 2, 0, 2, 1, 3, 2, 1, 0, 2, 2, 1, 4, 0, 1, 0, 0, 0, 3, 1, 0, 2, 4, 1, 4, 0, 2, 0, 0, 1, 3, 1, 1, 0, 0, 5, 0, 1, 3, 4, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1]

cp's OEIS Frontend

A290174 Maximal number of zeros that can be inserted one-by-one between the digits of prime(n) such that the number resulting from each step remains prime.

Table of values

List of values

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

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

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