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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.

A139566 a(n) is the sum of squares of digits of a(n-1); a(1)=15.

Table of values

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

List of values

[15, 26, 40, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 16, 37]

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

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