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.

A258373 a(n+1) is the least number not occurring earlier such that concatenation(a(n),a(n+1)) - 1 is a palindrome; a(1)=1.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 102
12 202
13 203
14 303
15 304
16 404
17 405
18 505
19 506
20 606
21 607
22 707
23 708
24 808
25 809
26 909
27 910
28 20
29 103
30 302
31 204
32 403
33 305
34 504
35 406
36 605
37 507
38 706
39 608
40 807
41 709
42 908
43 810
44 19
45 92
46 30
47 104
48 402
49 205
50 503
51 306
52 604
53 407
54 705
55 508
56 806
57 609
58 907
59 710
60 18

List of values

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 102, 202, 203, 303, 304, 404, 405, 505, 506, 606, 607, 707, 708, 808, 809, 909, 910, 20, 103, 302, 204, 403, 305, 504, 406, 605, 507, 706, 608, 807, 709, 908, 810, 19, 92, 30, 104, 402, 205, 503, 306, 604, 407, 705, 508, 806, 609, 907, 710, 18]

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

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