A358318 - cp's OEIS frontend

A358318 For n >= 5, a(n) is the number of zeros that need to be inserted to the left of the ones digit of the n-th prime so that the result is composite.

n	a(n)
5	2
6	2
7	2
8	4
9	1
10	1
11	1
12	2
13	3
14	1
15	1
16	3
17	3
18	2
19	3
20	5
21	1
22	2
23	1
24	3
25	5
26	1
27	1
28	1
29	3
30	3
31	1
32	3
33	3
34	1
35	4
36	1
37	1
38	1
39	3
40	1
41	2
42	2
43	3
44	1
45	2
46	1
47	1
48	3
49	2
50	1
51	1
52	2
53	1
54	1
55	1
56	1
57	2
58	1
59	2
60	5
61	2
62	2
63	1
64	1
65	1
66	1
67	2
68	2
69	2
70	1
71	1
72	1
73	6
74	1
75	2
76	2
77	1
78	2
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	2
88	3
89	1
90	2
91	1
92	1
93	1
94	1
95	3

[2, 2, 2, 4, 1, 1, 1, 2, 3, 1, 1, 3, 3, 2, 3, 5, 1, 2, 1, 3, 5, 1, 1, 1, 3, 3, 1, 3, 3, 1, 4, 1, 1, 1, 3, 1, 2, 2, 3, 1, 2, 1, 1, 3, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 5, 2, 2, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 6, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 3, 1, 2, 1, 1, 1, 1, 3]

cp's OEIS Frontend

A358318 For n >= 5, a(n) is the number of zeros that need to be inserted to the left of the ones digit of the n-th prime so that the result is composite.

Table of values

List of values

n	a(n)
5	2
6	2
7	2
8	4
9	1
10	1
11	1
12	2
13	3
14	1
15	1
16	3
17	3
18	2
19	3
20	5
21	1
22	2
23	1
24	3
25	5
26	1
27	1
28	1
29	3
30	3
31	1
32	3
33	3
34	1
35	4
36	1
37	1
38	1
39	3
40	1
41	2
42	2
43	3
44	1
45	2
46	1
47	1
48	3
49	2
50	1
51	1
52	2
53	1
54	1
55	1
56	1
57	2
58	1
59	2
60	5
61	2
62	2
63	1
64	1
65	1
66	1
67	2
68	2
69	2
70	1
71	1
72	1
73	6
74	1
75	2
76	2
77	1
78	2
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	2
88	3
89	1
90	2
91	1
92	1
93	1
94	1
95	3

n	a(n)
5	2
6	2
7	2
8	4
9	1
10	1
11	1
12	2
13	3
14	1
15	1
16	3
17	3
18	2
19	3
20	5
21	1
22	2
23	1
24	3
25	5
26	1
27	1
28	1
29	3
30	3
31	1
32	3
33	3
34	1
35	4
36	1
37	1
38	1
39	3
40	1
41	2
42	2
43	3
44	1
45	2
46	1
47	1
48	3
49	2
50	1
51	1
52	2
53	1
54	1
55	1
56	1
57	2
58	1
59	2
60	5
61	2
62	2
63	1
64	1
65	1
66	1
67	2
68	2
69	2
70	1
71	1
72	1
73	6
74	1
75	2
76	2
77	1
78	2
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	2
88	3
89	1
90	2
91	1
92	1
93	1
94	1
95	3

n	a(n)
5	2
6	2
7	2
8	4
9	1
10	1
11	1
12	2
13	3
14	1
15	1
16	3
17	3
18	2
19	3
20	5
21	1
22	2
23	1
24	3
25	5
26	1
27	1
28	1
29	3
30	3
31	1
32	3
33	3
34	1
35	4
36	1
37	1
38	1
39	3
40	1
41	2
42	2
43	3
44	1
45	2
46	1
47	1
48	3
49	2
50	1
51	1
52	2
53	1
54	1
55	1
56	1
57	2
58	1
59	2
60	5
61	2
62	2
63	1
64	1
65	1
66	1
67	2
68	2
69	2
70	1
71	1
72	1
73	6
74	1
75	2
76	2
77	1
78	2
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	2
88	3
89	1
90	2
91	1
92	1
93	1
94	1
95	3