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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.

A071240 Arithmetic mean of k and R(k) where k is a number using only odd digits and R(k) is its digit reversal (A004086).

Table of values

n a(n)
0 1
1 3
2 5
3 7
4 9
5 11
6 22
7 33
8 44
9 55
10 22
11 33
12 44
13 55
14 66
15 33
16 44
17 55
18 66
19 77
20 44
21 55
22 66
23 77
24 88
25 55
26 66
27 77
28 88
29 99
30 111
31 212
32 313
33 414
34 515
35 131
36 232
37 333
38 434
39 535
40 151
41 252
42 353
43 454
44 555
45 171
46 272
47 373
48 474
49 575
50 191
51 292
52 393
53 494
54 595
55 212
56 313
57 414
58 515
59 616

List of values

[1, 3, 5, 7, 9, 11, 22, 33, 44, 55, 22, 33, 44, 55, 66, 33, 44, 55, 66, 77, 44, 55, 66, 77, 88, 55, 66, 77, 88, 99, 111, 212, 313, 414, 515, 131, 232, 333, 434, 535, 151, 252, 353, 454, 555, 171, 272, 373, 474, 575, 191, 292, 393, 494, 595, 212, 313, 414, 515, 616]

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

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