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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.

A279818 a(n+1) = sum of digits of a(n), plus sum of same digits arising in all prior terms; a(1)=1.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 4
6 4
7 8
8 8
9 16
10 9
11 9
12 18
13 28
14 38
15 43
16 18
17 53
18 14
19 22
20 10
21 7
22 7
23 14
24 28
25 68
26 76
27 39
28 39
29 51
30 19
31 55
32 20
33 14
34 35
35 43
36 49
37 86
38 96
39 93
40 96
41 117
42 41
43 50
44 30
45 27
46 51
47 50
48 40
49 40
50 44
51 52
52 63
53 72
54 62
55 70
56 49
57 146
58 130
59 50
60 50
61 55
62 65
63 130
64 54
65 139
66 157
67 156
68 172
69 109
70 131

List of values

[1, 1, 2, 2, 4, 4, 8, 8, 16, 9, 9, 18, 28, 38, 43, 18, 53, 14, 22, 10, 7, 7, 14, 28, 68, 76, 39, 39, 51, 19, 55, 20, 14, 35, 43, 49, 86, 96, 93, 96, 117, 41, 50, 30, 27, 51, 50, 40, 40, 44, 52, 63, 72, 62, 70, 49, 146, 130, 50, 50, 55, 65, 130, 54, 139, 157, 156, 172, 109, 131]

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

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