A270035 - cp's OEIS frontend

A270035 a(n) is the smallest b for which the base-b representation of n contains at least one 9 (or 0 if no such base exists).

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

[0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 10, 21, 11, 23, 12, 25, 13, 27, 14, 29, 10, 31, 16, 11, 17, 35, 12, 37, 19, 13, 10, 41, 14, 43, 11, 15, 23, 47, 12, 49, 10, 17, 13, 53, 18, 11, 14, 19, 29, 59, 10, 61, 31, 21, 16, 13, 11, 67, 17, 23, 10, 71]

cp's OEIS Frontend

A270035 a(n) is the smallest b for which the base-b representation of n contains at least one 9 (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	0
6	0
7	0
8	0
9	10
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	0
18	0
19	10
20	11
21	12
22	13
23	14
24	15
25	16
26	17
27	18
28	19
29	10
30	21
31	11
32	23
33	12
34	25
35	13
36	27
37	14
38	29
39	10
40	31
41	16
42	11
43	17
44	35
45	12
46	37
47	19
48	13
49	10
50	41
51	14
52	43
53	11
54	15
55	23
56	47
57	12
58	49
59	10
60	17
61	13
62	53
63	18
64	11
65	14
66	19
67	29
68	59
69	10
70	61
71	31
72	21
73	16
74	13
75	11
76	67
77	17
78	23
79	10
80	71

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

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