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.

A291934 Largest k achievable by the iteration k->(sigma(k)+phi(k))/2 started at k=n, with termination when sigma(k) becomes odd.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 7
7 7
8 8
9 9
10 11
11 11
12 16
13 13
14 16
15 16
16 16
17 17
18 18
19 19
20 25
21 23
22 23
23 23
24 36
25 25
26 29
27 29
28 36
29 29
30 53
31 31
32 32
33 36
34 36
35 36
36 36
37 37
38 53
39 53
40 53
41 41
42 144
43 43
44 61
45 61
46 47
47 47
48 144
49 49
50 50
51 61
52 61
53 53
54 144
55 72
56 72
57 59
58 59
59 59
60 107
61 61
62 144

List of values

[1, 2, 3, 4, 5, 7, 7, 8, 9, 11, 11, 16, 13, 16, 16, 16, 17, 18, 19, 25, 23, 23, 23, 36, 25, 29, 29, 36, 29, 53, 31, 32, 36, 36, 36, 36, 37, 53, 53, 53, 41, 144, 43, 61, 61, 47, 47, 144, 49, 50, 61, 61, 53, 144, 72, 72, 59, 59, 59, 107, 61, 144]

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

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