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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A333687 a(n) is the minimal value of k >= 0, such that the concatenation of the decimal digits of n,n+1,...,n+k is divisible by the digit sum of the concatenation, or -1 if no such k is known.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 2
12 0
13 1
14 2
15 42
16 4
17 3
18 0
19 1
20 0
21 0
22 1
23 17
24 0
25 131
26 26
27 0
28 16
29 11
30 0
31 1
32 2
33 37
34 1
35 1
36 0
37 1
38 2
39 21
40 0
41 3
42 0
43 7
44 8
45 0
46 6
47 83
48 0
49 1
50 0
51 89
52 8
53 26
54 0
55 97
56 142783940
57 3
58 1
59 1
60 0
61 4
62 8
63 0
64 14
65 37
66 49994
67 380
68 20
69 17
70 0
71 65
72 0
73 62
74 1
75 3
76 -1
77 29
78 46
79 235
80 0
81 0
82 18
83 29
84 0
85 1
86 53

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, 2, 42, 4, 3, 0, 1, 0, 0, 1, 17, 0, 131, 26, 0, 16, 11, 0, 1, 2, 37, 1, 1, 0, 1, 2, 21, 0, 3, 0, 7, 8, 0, 6, 83, 0, 1, 0, 89, 8, 26, 0, 97, 142783940, 3, 1, 1, 0, 4, 8, 0, 14, 37, 49994, 380, 20, 17, 0, 65, 0, 62, 1, 3, -1, 29, 46, 235, 0, 0, 18, 29, 0, 1, 53]