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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.

A217159 a(n) is the least value of k such that the decimal expansion of n^k contains four consecutive identical digits.

Table of values

n a(n)
2 41
3 33
4 90
5 95
6 115
7 71
8 60
9 88
10 4
11 39
12 18
13 25
14 14
15 98
16 45
17 52
18 78
19 70
20 4
21 29
22 42
23 35
24 41
25 48
26 44
27 11
28 21
29 37
30 4
31 18
32 36
33 71
34 34
35 18
36 64
37 20
38 39
39 32
40 4
41 40
42 20
43 20
44 45
45 33
46 33
47 14
48 36
49 40
50 4
51 37
52 42
53 29
54 39
55 63
56 24
57 10
58 26
59 10
60 4
61 64
62 15
63 30
64 30
65 18
66 17
67 58

List of values

[41, 33, 90, 95, 115, 71, 60, 88, 4, 39, 18, 25, 14, 98, 45, 52, 78, 70, 4, 29, 42, 35, 41, 48, 44, 11, 21, 37, 4, 18, 36, 71, 34, 18, 64, 20, 39, 32, 4, 40, 20, 20, 45, 33, 33, 14, 36, 40, 4, 37, 42, 29, 39, 63, 24, 10, 26, 10, 4, 64, 15, 30, 30, 18, 17, 58]

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

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