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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.

A082381 Sequence of the squared digital root of a number until 1 or 4 is reached. The initial numbers 1,2,..n are not output.

Table of values

n a(n)
1 1
2 4
3 9
4 81
5 65
6 61
7 37
8 58
9 89
10 145
11 42
12 20
13 4
14 16
15 37
16 58
17 89
18 145
19 42
20 20
21 4
22 25
23 29
24 85
25 89
26 145
27 42
28 20
29 4
30 36
31 45
32 41
33 17
34 50
35 25
36 29
37 85
38 89
39 145
40 42
41 20
42 4
43 49
44 97
45 130
46 10
47 1
48 64
49 52
50 29
51 85
52 89
53 145
54 42
55 20
56 4
57 81
58 65
59 61
60 37
61 58
62 89
63 145
64 42
65 20
66 4
67 1
68 2
69 4
70 5
71 25
72 29

List of values

[1, 4, 9, 81, 65, 61, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 25, 29, 85, 89, 145, 42, 20, 4, 36, 45, 41, 17, 50, 25, 29, 85, 89, 145, 42, 20, 4, 49, 97, 130, 10, 1, 64, 52, 29, 85, 89, 145, 42, 20, 4, 81, 65, 61, 37, 58, 89, 145, 42, 20, 4, 1, 2, 4, 5, 25, 29]

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

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