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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.

A243590 Numbers returned when each digit of n is replaced by the sum modulo 10 of the digits to its (wrapped) left and (wrapped) right.

Table of values

n a(n)
1 2
2 4
3 6
4 8
5 0
6 2
7 4
8 6
9 8
10 2
11 22
12 42
13 62
14 82
15 2
16 22
17 42
18 62
19 82
20 4
21 24
22 44
23 64
24 84
25 4
26 24
27 44
28 64
29 84
30 6
31 26
32 46
33 66
34 86
35 6
36 26
37 46
38 66
39 86
40 8
41 28
42 48
43 68
44 88
45 8
46 28
47 48
48 68
49 88
50 0
51 20
52 40
53 60
54 80
55 0
56 20
57 40
58 60
59 80
60 2
61 22
62 42
63 62
64 82
65 2
66 22
67 42
68 62
69 82
70 4
71 24

List of values

[2, 4, 6, 8, 0, 2, 4, 6, 8, 2, 22, 42, 62, 82, 2, 22, 42, 62, 82, 4, 24, 44, 64, 84, 4, 24, 44, 64, 84, 6, 26, 46, 66, 86, 6, 26, 46, 66, 86, 8, 28, 48, 68, 88, 8, 28, 48, 68, 88, 0, 20, 40, 60, 80, 0, 20, 40, 60, 80, 2, 22, 42, 62, 82, 2, 22, 42, 62, 82, 4, 24]

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

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