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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.

A116439 Numbers k which when sandwiched between two 4's give a multiple of k.

Table of values

n a(n)
1 1
2 2
3 4
4 11
5 13
6 14
7 22
8 26
9 28
10 44
11 52
12 77
13 91
14 137
15 146
16 274
17 292
18 548
19 9091
20 19802
21 39604
22 909091
23 5882353
24 10989011
25 12987013
26 13986014
27 15037594
28 16194332
29 19138756
30 21978022
31 25974026
32 27972028
33 30075188
34 43956044
35 51948052
36 52631579
37 76923077
38 90909091

List of values

[1, 2, 4, 11, 13, 14, 22, 26, 28, 44, 52, 77, 91, 137, 146, 274, 292, 548, 9091, 19802, 39604, 909091, 5882353, 10989011, 12987013, 13986014, 15037594, 16194332, 19138756, 21978022, 25974026, 27972028, 30075188, 43956044, 51948052, 52631579, 76923077, 90909091]

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

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