A191350 - cp's OEIS frontend

A191350 The number of bases not exceeding n+1 in which the expansion of n (i) has only digits <=9 and (ii) represents a prime if digits are concatenated/reinterpreted as decimals.

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

[1, 2, 1, 3, 1, 3, 2, 2, 3, 3, 2, 4, 2, 4, 4, 5, 3, 7, 4, 6, 6, 8, 4, 7, 5, 6, 6, 8, 4, 9, 4, 9, 7, 7, 4, 11, 5, 9, 6, 8, 4, 13, 4, 8, 7, 10, 5, 10, 5, 8, 7, 9, 4, 14, 5, 8, 8, 11, 4, 12, 4, 10, 8, 8, 5, 15, 6, 8, 6, 13, 4, 14, 5, 10, 6, 8, 6, 17, 5, 8, 7, 12, 6, 13, 5, 11, 8, 11, 4, 15, 5]

cp's OEIS Frontend

A191350 The number of bases not exceeding n+1 in which the expansion of n (i) has only digits <=9 and (ii) represents a prime if digits are concatenated/reinterpreted as decimals.

Table of values

List of values

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

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

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