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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.

A116444 Numbers k which when sandwiched between two 9's give a multiple of k.

Table of values

n a(n)
1 1
2 3
3 9
4 11
5 13
6 21
7 33
8 39
9 63
10 77
11 91
12 99
13 137
14 219
15 411
16 657
17 9091
18 29703
19 89109
20 909091
21 5882353
22 10989011
23 12145749
24 12987013
25 14354067
26 20979021
27 22556391
28 32967033
29 36437247
30 38961039
31 43062201
32 52631579
33 62937063
34 67669173
35 76923077
36 90909091
37 98901099

List of values

[1, 3, 9, 11, 13, 21, 33, 39, 63, 77, 91, 99, 137, 219, 411, 657, 9091, 29703, 89109, 909091, 5882353, 10989011, 12145749, 12987013, 14354067, 20979021, 22556391, 32967033, 36437247, 38961039, 43062201, 52631579, 62937063, 67669173, 76923077, 90909091, 98901099]

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

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