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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.

A067552 a(n) = SumOfDigits(n)^2 - SumOfDigits(n^2), where SumOfDigits = A007953.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 9
5 18
6 27
7 36
8 54
9 72
10 0
11 0
12 0
13 0
14 9
15 27
16 36
17 45
18 72
19 90
20 0
21 0
22 0
23 9
24 18
25 36
26 45
27 63
28 81
29 108
30 0
31 0
32 18
33 18
34 36
35 54
36 63
37 81
38 108
39 135
40 9
41 9
42 18
43 27
44 45
45 72
46 90
47 108
48 135
49 162
50 18
51 27
52 36
53 45
54 63
55 90
56 108
57 126
58 153
59 180
60 27
61 36
62 45
63 54
64 81
65 108
66 126
67 144
68 180
69 207

List of values

[0, 0, 0, 0, 9, 18, 27, 36, 54, 72, 0, 0, 0, 0, 9, 27, 36, 45, 72, 90, 0, 0, 0, 9, 18, 36, 45, 63, 81, 108, 0, 0, 18, 18, 36, 54, 63, 81, 108, 135, 9, 9, 18, 27, 45, 72, 90, 108, 135, 162, 18, 27, 36, 45, 63, 90, 108, 126, 153, 180, 27, 36, 45, 54, 81, 108, 126, 144, 180, 207]

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

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