A344888 - cp's OEIS frontend

A344888 a(n) is the least base k >= 2 where n is an undulating number (i.e., with digits of the form abababab...).

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

[2, 2, 2, 2, 3, 2, 3, 2, 3, 4, 2, 4, 4, 3, 4, 2, 3, 4, 5, 5, 3, 2, 5, 3, 5, 4, 3, 6, 6, 4, 3, 2, 6, 6, 4, 6, 5, 6, 4, 7, 3, 5, 2, 6, 7, 7, 4, 7, 7, 6, 3, 4, 5, 8, 8, 4, 8, 5, 8, 4, 3, 6, 5, 2, 7, 8, 9, 5, 4, 9, 3, 7, 5, 8, 6, 9, 9, 9, 5, 9, 3, 8, 9, 5, 10, 2, 6]

cp's OEIS Frontend

A344888 a(n) is the least base k >= 2 where n is an undulating number (i.e., with digits of the form abababab...).

Table of values

List of values

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

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

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