cp's OEIS Frontend

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.

A331619 a(n) is the smallest positive number k such that the decimal expansion of n*2^k contains the string n.

Table of values

n a(n)
0 1
1 4
2 4
3 7
4 4
5 9
6 4
7 8
8 4
9 10
10 10
11 10
12 10
13 10
14 10
15 10
16 10
17 7
18 10
19 10
20 4
21 10
22 10
23 10
24 10
25 10
26 10
27 10
28 10
29 10
30 10
31 10
32 10
33 10
34 10
35 10
36 10
37 10
38 10
39 10
40 4
41 10
42 28
43 19
44 13
45 15
46 16
47 40
48 20
49 30
50 53
51 27
52 20
53 27
54 35
55 30
56 20
57 53
58 31
59 20
60 4
61 8
62 18
63 35
64 20
65 10
66 30
67 23
68 20

List of values

[1, 4, 4, 7, 4, 9, 4, 8, 4, 10, 10, 10, 10, 10, 10, 10, 10, 7, 10, 10, 4, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 4, 10, 28, 19, 13, 15, 16, 40, 20, 30, 53, 27, 20, 27, 35, 30, 20, 53, 31, 20, 4, 8, 18, 35, 20, 10, 30, 23, 20]

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

Content is available under The OEIS End-User License Agreement.