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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.

A217160 a(n) is the least value of k such that the decimal expansion of n^k contains five consecutive identical digits.

Table of values

n a(n)
2 220
3 274
4 110
5 125
6 226
7 172
8 105
9 137
10 5
11 156
12 40
13 227
14 196
15 216
16 55
17 235
18 78
19 115
20 5
21 104
22 133
23 187
24 126
25 93
26 115
27 110
28 21
29 163
30 5
31 40
32 44
33 159
34 104
35 110
36 113
37 20
38 200
39 205
40 5
41 119
42 142
43 116
44 90
45 145
46 156
47 136
48 37
49 86
50 5
51 37
52 62
53 119
54 85
55 91
56 107
57 142
58 40

List of values

[220, 274, 110, 125, 226, 172, 105, 137, 5, 156, 40, 227, 196, 216, 55, 235, 78, 115, 5, 104, 133, 187, 126, 93, 115, 110, 21, 163, 5, 40, 44, 159, 104, 110, 113, 20, 200, 205, 5, 119, 142, 116, 90, 145, 156, 136, 37, 86, 5, 37, 62, 119, 85, 91, 107, 142, 40]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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