A270030 - cp's OEIS frontend

A270030 a(n) is the smallest b for which the base-b representation of n contains at least one 4 (or 0 if no such base exists).

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

[0, 0, 0, 5, 0, 0, 0, 0, 5, 6, 7, 8, 9, 5, 11, 6, 13, 7, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 5, 7, 7, 7, 7, 5, 8, 8, 8, 8, 5, 6, 9, 9, 9, 5, 5, 5, 5, 5, 5, 11, 11, 6, 7, 5, 12, 12, 12, 6, 5, 6, 6, 6, 6, 5, 6, 14, 7, 8, 5, 5, 5, 5, 5, 5, 16, 6, 7, 7, 5, 7, 7, 6, 7, 5, 9, 18, 18, 6, 5, 19]

cp's OEIS Frontend

A270030 a(n) is the smallest b for which the base-b representation of n contains at least one 4 (or 0 if no such base exists).

Table of values

List of values

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

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

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