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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.

A069940 (1/2)*((Sum of digits of n)^2 + (Sum of digits^2 of n)).

Table of values

n a(n)
0 0
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 1
11 3
12 7
13 13
14 21
15 31
16 43
17 57
18 73
19 91
20 4
21 7
22 12
23 19
24 28
25 39
26 52
27 67
28 84
29 103
30 9
31 13
32 19
33 27
34 37
35 49
36 63
37 79
38 97
39 117
40 16
41 21
42 28
43 37
44 48
45 61
46 76
47 93
48 112
49 133
50 25
51 31
52 39
53 49
54 61
55 75
56 91
57 109
58 129
59 151
60 36
61 43
62 52
63 63
64 76
65 91
66 108
67 127

List of values

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 1, 3, 7, 13, 21, 31, 43, 57, 73, 91, 4, 7, 12, 19, 28, 39, 52, 67, 84, 103, 9, 13, 19, 27, 37, 49, 63, 79, 97, 117, 16, 21, 28, 37, 48, 61, 76, 93, 112, 133, 25, 31, 39, 49, 61, 75, 91, 109, 129, 151, 36, 43, 52, 63, 76, 91, 108, 127]

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

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