A270031 - cp's OEIS frontend

A270031 a(n) is the smallest b for which the base-b representation of n contains at least one 5 (or 0 if no such base exists).

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

[0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 6, 7, 8, 9, 10, 11, 6, 13, 7, 15, 8, 17, 6, 19, 10, 7, 11, 23, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 6, 8, 8, 8, 8, 8, 6, 9, 9, 9, 9, 9, 6, 7, 10, 10, 10, 10, 6, 11, 7, 11, 11, 11, 6, 6, 6, 6, 6, 6, 6, 13, 13, 13, 7, 13, 6, 14, 14, 14, 14, 7, 6, 7, 7, 7, 7, 7]

cp's OEIS Frontend

A270031 a(n) is the smallest b for which the base-b representation of n contains at least one 5 (or 0 if no such base exists).

Table of values

List of values

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

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

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