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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.

A280894 a(n) is the largest prime factor of the concatenation of a(n-2) and a(n-1), with a(1)=1 and a(2)=2.

Table of values

n a(n)
1 1
2 2
3 3
4 23
5 19
6 773
7 13
8 25771
9 1325771
10 85903775257
11 2599552664779907
12 4078014120856770452857
13 770310365288124131869
14 47072294862890243358278834974724275093
15 8735279620054327668810964663269852011597
16 1500540910023123440069025527770773118908806062201

List of values

[1, 2, 3, 23, 19, 773, 13, 25771, 1325771, 85903775257, 2599552664779907, 4078014120856770452857, 770310365288124131869, 47072294862890243358278834974724275093, 8735279620054327668810964663269852011597, 1500540910023123440069025527770773118908806062201]

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

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