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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.

A071242 Arithmetic mean of n and R(n) where n is a number such that the least significant digit and the most significant digits are of same parity and R(n) is its digit reversal (A004086).

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 11
11 22
12 33
13 44
14 55
15 11
16 22
17 33
18 44
19 55
20 22
21 33
22 44
23 55
24 66
25 22
26 33
27 44
28 55
29 66
30 33
31 44
32 55
33 66
34 77
35 33
36 44
37 55
38 66
39 77
40 44
41 55
42 66
43 77
44 88
45 44
46 55
47 66
48 77
49 88
50 55
51 66
52 77
53 88
54 99
55 101
56 202
57 303
58 404
59 505
60 111
61 212
62 313
63 414
64 515
65 121

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 11, 22, 33, 44, 55, 22, 33, 44, 55, 66, 22, 33, 44, 55, 66, 33, 44, 55, 66, 77, 33, 44, 55, 66, 77, 44, 55, 66, 77, 88, 44, 55, 66, 77, 88, 55, 66, 77, 88, 99, 101, 202, 303, 404, 505, 111, 212, 313, 414, 515, 121]

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

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