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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.

A190839 a(n) is the greatest prime divisor of 10^(2*n)+10^n+1.

Table of values

n a(n)
1 37
2 37
3 333667
4 9901
5 2906161
6 333667
7 10838689
8 99990001
9 440334654777631
10 2906161
11 1344628210313298373
12 999999000001
13 900900900900990990990991
14 10838689
15 4185502830133110721
16 9999999900000001
17 13168164561429877
18 440334654777631
19 3931123022305129377976519
20 39526741

List of values

[37, 37, 333667, 9901, 2906161, 333667, 10838689, 99990001, 440334654777631, 2906161, 1344628210313298373, 999999000001, 900900900900990990990991, 10838689, 4185502830133110721, 9999999900000001, 13168164561429877, 440334654777631, 3931123022305129377976519, 39526741]

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

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