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.

A119107 Triangular numbers composed of digits {1,2,8}.

Table of values

n a(n)
1 1
2 21
3 28
4 1128
5 2211
6 8128
7 118828
8 222111
9 821121
10 828828
11 881128
12 1188111
13 1828828
14 22221111
15 28218828
16 88811128
17 1821212128
18 2222211111
19 8888111128
20 222222111111
21 888881111128
22 22222221111111
23 88888811111128
24 1122211112118111
25 2222222211111111

List of values

[1, 21, 28, 1128, 2211, 8128, 118828, 222111, 821121, 828828, 881128, 1188111, 1828828, 22221111, 28218828, 88811128, 1821212128, 2222211111, 8888111128, 222222111111, 888881111128, 22222221111111, 88888811111128, 1122211112118111, 2222222211111111]