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.

A117304 Numbers with an even number of digits such that the second half is twice the first half.

Table of values

n a(n)
1 12
2 24
3 36
4 48
5 1020
6 1122
7 1224
8 1326
9 1428
10 1530
11 1632
12 1734
13 1836
14 1938
15 2040
16 2142
17 2244
18 2346
19 2448
20 2550
21 2652
22 2754
23 2856
24 2958
25 3060
26 3162
27 3264
28 3366
29 3468
30 3570
31 3672
32 3774
33 3876
34 3978
35 4080
36 4182
37 4284
38 4386
39 4488
40 4590
41 4692
42 4794
43 4896

List of values

[12, 24, 36, 48, 1020, 1122, 1224, 1326, 1428, 1530, 1632, 1734, 1836, 1938, 2040, 2142, 2244, 2346, 2448, 2550, 2652, 2754, 2856, 2958, 3060, 3162, 3264, 3366, 3468, 3570, 3672, 3774, 3876, 3978, 4080, 4182, 4284, 4386, 4488, 4590, 4692, 4794, 4896]