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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.

A253241 The "Reverse and Add!" problem in base 12: sequence lists the final palindrome number for n, or -1 if no palindrome is ever reached. (Written in base 10.)

Table of values

n a(n)
0 0
1 2
2 4
3 6
4 8
5 10
6 13
7 39
8 65
9 91
10 117
11 143
12 13
13 26
14 39
15 52
16 65
17 78
18 91
19 104
20 117
21 130
22 143
23 169
24 26
25 39
26 52
27 65
28 78
29 91
30 104
31 117
32 130
33 143
34 169
35 169
36 39
37 52
38 65
39 78
40 91
41 104
42 117
43 130
44 143
45 169
46 169
47 507
48 52
49 65
50 78
51 91
52 104
53 117
54 130
55 143
56 169
57 169
58 507
59 676
60 65
61 78
62 91
63 104
64 117

List of values

[0, 2, 4, 6, 8, 10, 13, 39, 65, 91, 117, 143, 13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 169, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 169, 169, 39, 52, 65, 78, 91, 104, 117, 130, 143, 169, 169, 507, 52, 65, 78, 91, 104, 117, 130, 143, 169, 169, 507, 676, 65, 78, 91, 104, 117]

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

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