A270029 - cp's OEIS frontend

A270029 a(n) is the smallest b for which the base-b representation of n contains at least one 3 (or 0 if no such base exists).

n	a(n)
1	0
2	0
3	4
4	0
5	0
6	0
7	4
8	5
9	6
10	7
11	4
12	4
13	4
14	4
15	4
16	5
17	5
18	5
19	4
20	6
21	6
22	6
23	4
24	7
25	7
26	7
27	4
28	4
29	4
30	4
31	4
32	9
33	5
34	9
35	4
36	10
37	10
38	5
39	4
40	5
41	5
42	5
43	4
44	4
45	4
46	4
47	4
48	4
49	4
50	4
51	4
52	4
53	4
54	4
55	4
56	4
57	4
58	4
59	4
60	4
61	4
62	4
63	4
64	17
65	5
66	5
67	4
68	5
69	5
70	7
71	4
72	7
73	5
74	7
75	4
76	4
77	4
78	4
79	4
80	5
81	5
82	5
83	4
84	5
85	5
86	5
87	4
88	5
89	5
90	5
91	4
92	4
93	4
94	4
95	4
96	5
97	5
98	5
99	4
100	26

[0, 0, 4, 0, 0, 0, 4, 5, 6, 7, 4, 4, 4, 4, 4, 5, 5, 5, 4, 6, 6, 6, 4, 7, 7, 7, 4, 4, 4, 4, 4, 9, 5, 9, 4, 10, 10, 5, 4, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 17, 5, 5, 4, 5, 5, 7, 4, 7, 5, 7, 4, 4, 4, 4, 4, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 4, 4, 4, 4, 4, 5, 5, 5, 4, 26]

cp's OEIS Frontend

A270029 a(n) is the smallest b for which the base-b representation of n contains at least one 3 (or 0 if no such base exists).

Table of values

List of values

n	a(n)
1	0
2	0
3	4
4	0
5	0
6	0
7	4
8	5
9	6
10	7
11	4
12	4
13	4
14	4
15	4
16	5
17	5
18	5
19	4
20	6
21	6
22	6
23	4
24	7
25	7
26	7
27	4
28	4
29	4
30	4
31	4
32	9
33	5
34	9
35	4
36	10
37	10
38	5
39	4
40	5
41	5
42	5
43	4
44	4
45	4
46	4
47	4
48	4
49	4
50	4
51	4
52	4
53	4
54	4
55	4
56	4
57	4
58	4
59	4
60	4
61	4
62	4
63	4
64	17
65	5
66	5
67	4
68	5
69	5
70	7
71	4
72	7
73	5
74	7
75	4
76	4
77	4
78	4
79	4
80	5
81	5
82	5
83	4
84	5
85	5
86	5
87	4
88	5
89	5
90	5
91	4
92	4
93	4
94	4
95	4
96	5
97	5
98	5
99	4
100	26

n	a(n)
1	0
2	0
3	4
4	0
5	0
6	0
7	4
8	5
9	6
10	7
11	4
12	4
13	4
14	4
15	4
16	5
17	5
18	5
19	4
20	6
21	6
22	6
23	4
24	7
25	7
26	7
27	4
28	4
29	4
30	4
31	4
32	9
33	5
34	9
35	4
36	10
37	10
38	5
39	4
40	5
41	5
42	5
43	4
44	4
45	4
46	4
47	4
48	4
49	4
50	4
51	4
52	4
53	4
54	4
55	4
56	4
57	4
58	4
59	4
60	4
61	4
62	4
63	4
64	17
65	5
66	5
67	4
68	5
69	5
70	7
71	4
72	7
73	5
74	7
75	4
76	4
77	4
78	4
79	4
80	5
81	5
82	5
83	4
84	5
85	5
86	5
87	4
88	5
89	5
90	5
91	4
92	4
93	4
94	4
95	4
96	5
97	5
98	5
99	4
100	26

n	a(n)
1	0
2	0
3	4
4	0
5	0
6	0
7	4
8	5
9	6
10	7
11	4
12	4
13	4
14	4
15	4
16	5
17	5
18	5
19	4
20	6
21	6
22	6
23	4
24	7
25	7
26	7
27	4
28	4
29	4
30	4
31	4
32	9
33	5
34	9
35	4
36	10
37	10
38	5
39	4
40	5
41	5
42	5
43	4
44	4
45	4
46	4
47	4
48	4
49	4
50	4
51	4
52	4
53	4
54	4
55	4
56	4
57	4
58	4
59	4
60	4
61	4
62	4
63	4
64	17
65	5
66	5
67	4
68	5
69	5
70	7
71	4
72	7
73	5
74	7
75	4
76	4
77	4
78	4
79	4
80	5
81	5
82	5
83	4
84	5
85	5
86	5
87	4
88	5
89	5
90	5
91	4
92	4
93	4
94	4
95	4
96	5
97	5
98	5
99	4
100	26