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.

A072139 Last term of the preperiodic part of the 'Reverse and Subtract' trajectory of n, or -1 if the trajectory is completely periodic.

Table of values

n a(n)
0 -1
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 9
11 11
12 9
13 9
14 9
15 9
16 9
17 9
18 9
19 9
20 9
21 9
22 22
23 9
24 9
25 9
26 9
27 9
28 9
29 9
30 9
31 9
32 9
33 33
34 9
35 9
36 9
37 9
38 9
39 9
40 9
41 9
42 9
43 9
44 44
45 9
46 9
47 9
48 9
49 9
50 9
51 9
52 9
53 9
54 9
55 55
56 9
57 9
58 9
59 9
60 9
61 9
62 9
63 9
64 9
65 9
66 66
67 9
68 9
69 9
70 9
71 9
72 9
73 9
74 9
75 9
76 9
77 77
78 9
79 9
80 9
81 9
82 9
83 9
84 9
85 9
86 9
87 9
88 88
89 9
90 9
91 9
92 9
93 9
94 9
95 9
96 9
97 9
98 9
99 99
100 99
101 101
102 99

List of values

[-1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 22, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 33, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 44, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 55, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 66, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 77, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 88, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 99, 99, 101, 99]