A386929 - cp's OEIS frontend

A386929 a(n) is the least base b in {2,...,10} such that the base-b expansion of n, when read as a decimal integer, is prime; a(n) = 0 if no such base exists.

n	a(n)
1	0
2	3
3	2
4	3
5	2
6	5
7	4
8	5
9	6
10	3
11	4
12	9
13	4
14	0
15	6
16	5
17	4
18	0
19	4
20	0
21	5
22	3
23	2
24	0
25	6
26	5
27	6
28	5
29	4
30	0
31	7
32	0
33	5
34	3
35	8
36	0
37	4
38	7
39	6
40	0
41	5
42	0
43	4
44	0
45	6
46	3
47	2
48	9
49	8
50	7
51	0
52	7
53	4
54	0
55	4
56	5
57	8
58	3
59	7
60	0
61	4
62	0
63	5
64	9
65	8
66	9
67	3
68	5
69	0
70	0
71	4
72	0
73	4
74	0
75	8
76	0
77	4
78	0
79	3
80	0
81	5
82	9
83	4
84	9
85	7
86	0
87	6
88	9
89	2
90	0
91	4
92	0
93	6
94	3
95	8

[0, 3, 2, 3, 2, 5, 4, 5, 6, 3, 4, 9, 4, 0, 6, 5, 4, 0, 4, 0, 5, 3, 2, 0, 6, 5, 6, 5, 4, 0, 7, 0, 5, 3, 8, 0, 4, 7, 6, 0, 5, 0, 4, 0, 6, 3, 2, 9, 8, 7, 0, 7, 4, 0, 4, 5, 8, 3, 7, 0, 4, 0, 5, 9, 8, 9, 3, 5, 0, 0, 4, 0, 4, 0, 8, 0, 4, 0, 3, 0, 5, 9, 4, 9, 7, 0, 6, 9, 2, 0, 4, 0, 6, 3, 8]

cp's OEIS Frontend

A386929 a(n) is the least base b in {2,...,10} such that the base-b expansion of n, when read as a decimal integer, is prime; a(n) = 0 if no such base exists.

Table of values

List of values

n	a(n)
1	0
2	3
3	2
4	3
5	2
6	5
7	4
8	5
9	6
10	3
11	4
12	9
13	4
14	0
15	6
16	5
17	4
18	0
19	4
20	0
21	5
22	3
23	2
24	0
25	6
26	5
27	6
28	5
29	4
30	0
31	7
32	0
33	5
34	3
35	8
36	0
37	4
38	7
39	6
40	0
41	5
42	0
43	4
44	0
45	6
46	3
47	2
48	9
49	8
50	7
51	0
52	7
53	4
54	0
55	4
56	5
57	8
58	3
59	7
60	0
61	4
62	0
63	5
64	9
65	8
66	9
67	3
68	5
69	0
70	0
71	4
72	0
73	4
74	0
75	8
76	0
77	4
78	0
79	3
80	0
81	5
82	9
83	4
84	9
85	7
86	0
87	6
88	9
89	2
90	0
91	4
92	0
93	6
94	3
95	8

n	a(n)
1	0
2	3
3	2
4	3
5	2
6	5
7	4
8	5
9	6
10	3
11	4
12	9
13	4
14	0
15	6
16	5
17	4
18	0
19	4
20	0
21	5
22	3
23	2
24	0
25	6
26	5
27	6
28	5
29	4
30	0
31	7
32	0
33	5
34	3
35	8
36	0
37	4
38	7
39	6
40	0
41	5
42	0
43	4
44	0
45	6
46	3
47	2
48	9
49	8
50	7
51	0
52	7
53	4
54	0
55	4
56	5
57	8
58	3
59	7
60	0
61	4
62	0
63	5
64	9
65	8
66	9
67	3
68	5
69	0
70	0
71	4
72	0
73	4
74	0
75	8
76	0
77	4
78	0
79	3
80	0
81	5
82	9
83	4
84	9
85	7
86	0
87	6
88	9
89	2
90	0
91	4
92	0
93	6
94	3
95	8

n	a(n)
1	0
2	3
3	2
4	3
5	2
6	5
7	4
8	5
9	6
10	3
11	4
12	9
13	4
14	0
15	6
16	5
17	4
18	0
19	4
20	0
21	5
22	3
23	2
24	0
25	6
26	5
27	6
28	5
29	4
30	0
31	7
32	0
33	5
34	3
35	8
36	0
37	4
38	7
39	6
40	0
41	5
42	0
43	4
44	0
45	6
46	3
47	2
48	9
49	8
50	7
51	0
52	7
53	4
54	0
55	4
56	5
57	8
58	3
59	7
60	0
61	4
62	0
63	5
64	9
65	8
66	9
67	3
68	5
69	0
70	0
71	4
72	0
73	4
74	0
75	8
76	0
77	4
78	0
79	3
80	0
81	5
82	9
83	4
84	9
85	7
86	0
87	6
88	9
89	2
90	0
91	4
92	0
93	6
94	3
95	8