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.

A319921 Underline the central digit of all terms: the underlined digits reconstruct the starting sequence. This is also true if one translates the sequence in French and underlines the central letter of each word: the underlined letters spell the (French) sequence again. This is the lexicographically earliest sequence of distinct terms.

Table of values

n a(n)
1 331
2 233
3 10177
4 224
5 10314
6 10323
7 210
8 203
9 110
10 10717
11 84700
12 420
13 121
14 340
15 311
16 206
17 236
18 10182
19 10454
20 112
21 302
22 99300
23 10217
24 10331
25 10206
26 212
27 103
28 326
29 10033
30 136
31 216
32 217
33 305
34 218
35 10084
36 270
37 117
38 470
39 1008224
40 43400
41 170
42 11000
43 10024
44 21400
45 14201
46 307
47 410
48 10210
49 313
50 332
51 1004644
52 10066
53 10304
54 32100
55 10184
56 122

List of values

[331, 233, 10177, 224, 10314, 10323, 210, 203, 110, 10717, 84700, 420, 121, 340, 311, 206, 236, 10182, 10454, 112, 302, 99300, 10217, 10331, 10206, 212, 103, 326, 10033, 136, 216, 217, 305, 218, 10084, 270, 117, 470, 1008224, 43400, 170, 11000, 10024, 21400, 14201, 307, 410, 10210, 313, 332, 1004644, 10066, 10304, 32100, 10184, 122]

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

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