A338295 - cp's OEIS frontend

A338295 For n > 1, a(n) is the largest base b <= n such that the digits of n in base b contain the digit b-1; a(1) = 1.

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

[1, 2, 2, 2, 3, 3, 4, 3, 5, 2, 6, 4, 7, 5, 8, 3, 9, 3, 10, 7, 11, 5, 12, 5, 13, 9, 14, 4, 15, 6, 16, 11, 17, 7, 18, 2, 19, 13, 20, 2, 21, 7, 22, 15, 23, 7, 24, 7, 25, 17, 26, 4, 27, 11, 28, 19, 29, 8, 30, 8, 31, 21, 32, 13, 33, 6, 34, 23, 35, 6]

cp's OEIS Frontend

A338295 For n > 1, a(n) is the largest base b <= n such that the digits of n in base b contain the digit b-1; a(1) = 1.

Table of values

List of values

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

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

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