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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.

A304440 Add to n the sum of its even digits minus the sum of its odd digits.

Table of values

n a(n)
0 0
1 0
2 4
3 0
4 8
5 0
6 12
7 0
8 16
9 0
10 9
11 9
12 13
13 9
14 17
15 9
16 21
17 9
18 25
19 9
20 22
21 22
22 26
23 22
24 30
25 22
26 34
27 22
28 38
29 22
30 27
31 27
32 31
33 27
34 35
35 27
36 39
37 27
38 43
39 27
40 44
41 44
42 48
43 44
44 52
45 44
46 56
47 44
48 60
49 44
50 45
51 45
52 49
53 45
54 53
55 45
56 57
57 45
58 61
59 45
60 66
61 66
62 70
63 66
64 74
65 66
66 78
67 66
68 82
69 66
70 63

List of values

[0, 0, 4, 0, 8, 0, 12, 0, 16, 0, 9, 9, 13, 9, 17, 9, 21, 9, 25, 9, 22, 22, 26, 22, 30, 22, 34, 22, 38, 22, 27, 27, 31, 27, 35, 27, 39, 27, 43, 27, 44, 44, 48, 44, 52, 44, 56, 44, 60, 44, 45, 45, 49, 45, 53, 45, 57, 45, 61, 45, 66, 66, 70, 66, 74, 66, 78, 66, 82, 66, 63]

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

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