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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.

A376689 a(n) is the first number that is a prime times 3^n and ends in exactly n 1's.

Table of values

n a(n)
0 2
1 21
2 711
3 240111
4 51111
5 45411111
6 16059111111
7 43761111111
8 2121411111111
9 328203111111111
10 11862441111111111
11 37253511111111111
12 10630644111111111111
13 141896571111111111111
14 17806995411111111111111
15 9675948111111111111111
16 11187474501111111111111111
17 235460890911111111111111111

List of values

[2, 21, 711, 240111, 51111, 45411111, 16059111111, 43761111111, 2121411111111, 328203111111111, 11862441111111111, 37253511111111111, 10630644111111111111, 141896571111111111111, 17806995411111111111111, 9675948111111111111111, 11187474501111111111111111, 235460890911111111111111111]

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

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