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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.

A081173 a(1) = 2, then a(n) = greatest prime factor of (a(n-1)^2+2).

Table of values

n a(n)
1 2
2 3
3 11
4 41
5 17
6 97
7 3137
8 13499
9 60741001
10 14158633
11 7424699571433
12 18375387908679124623224497
13 152868746152697352174823427
14 114585848725150699093848122619332057
15 2117552824725684501808097956698634897
16 34759922213207174486822944687721824905112848905750167403101021576017059
17 57191433705834025254780615830990723253902440879104281100230506839641

List of values

[2, 3, 11, 41, 17, 97, 3137, 13499, 60741001, 14158633, 7424699571433, 18375387908679124623224497, 152868746152697352174823427, 114585848725150699093848122619332057, 2117552824725684501808097956698634897, 34759922213207174486822944687721824905112848905750167403101021576017059, 57191433705834025254780615830990723253902440879104281100230506839641]

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

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