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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.

A116440 Numbers k which when sandwiched between two 5's give a multiple of k.

Table of values

n a(n)
1 1
2 5
3 11
4 13
5 35
6 55
7 65
8 77
9 91
10 137
11 365
12 685
13 9091
14 49505
15 909091
16 5882353
17 10989011
18 12987013
19 20242915
20 23923445
21 34965035
22 37593985
23 52631579
24 54945055
25 64935065
26 76923077
27 90909091
28 495049505
29 1976284585
30 4132231405
31 4347826087
32 9090909091
33 13698630137

List of values

[1, 5, 11, 13, 35, 55, 65, 77, 91, 137, 365, 685, 9091, 49505, 909091, 5882353, 10989011, 12987013, 20242915, 23923445, 34965035, 37593985, 52631579, 54945055, 64935065, 76923077, 90909091, 495049505, 1976284585, 4132231405, 4347826087, 9090909091, 13698630137]

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

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