cp's OEIS Frontend

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.

A193996 Numbers that require exactly 8 iterations to determine that they are happy or not (A007770 and A031177).

Table of values

n a(n)
1 4
2 16
3 20
4 37
5 42
6 58
7 89
8 145
9 78999
10 79899
11 79989
12 79998
13 87999
14 89799
15 89979
16 89997
17 97899
18 97989
19 97998
20 98799
21 98979
22 98997
23 99789
24 99798
25 99879
26 99897
27 99978
28 99987
29 378999
30 379899
31 379989
32 379998
33 387999
34 389799
35 389979
36 389997
37 389999
38 397899
39 397989

List of values

[4, 16, 20, 37, 42, 58, 89, 145, 78999, 79899, 79989, 79998, 87999, 89799, 89979, 89997, 97899, 97989, 97998, 98799, 98979, 98997, 99789, 99798, 99879, 99897, 99978, 99987, 378999, 379899, 379989, 379998, 387999, 389799, 389979, 389997, 389999, 397899, 397989]

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

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