A109783 - cp's OEIS frontend

A109783 a(n) is the largest possible K such that there exists a K-digit in base n integer M such that for each N=1,2,...,K, the integer given by the first N digits of M in base n is divisible by N.

n	a(n)
2	2
3	6
4	7
5	10
6	11
7	18
8	17
9	22
10	25
11	26
12	28
13	35
14	39
15	38
16	39
17	45
18	48
19	48
20	52
21	53
22	56
23	58
24	61
25	65
26	67
27	69
28	73
29	75
30	79
31	83
32	83

[2, 6, 7, 10, 11, 18, 17, 22, 25, 26, 28, 35, 39, 38, 39, 45, 48, 48, 52, 53, 56, 58, 61, 65, 67, 69, 73, 75, 79, 83, 83]