A034969 - cp's OEIS frontend

A034969 a(1) = a(2) = 1, a(n) is largest prime factor of concatenation of a(n - 2) and a(n - 1).

n	a(n)
1	1
2	1
3	11
4	37
5	379
6	37379
7	130369
8	463
9	12277
10	4210207
11	1015309
12	42102071015309
13	7522851571
14	39903394005601130021
15	747580650949733
16	2601211879473948668292638737
17	16287160151410310678021523908384898241043
18	37391601140774556436246253

[1, 1, 11, 37, 379, 37379, 130369, 463, 12277, 4210207, 1015309, 42102071015309, 7522851571, 39903394005601130021, 747580650949733, 2601211879473948668292638737, 16287160151410310678021523908384898241043, 37391601140774556436246253]

cp's OEIS Frontend

A034969 a(1) = a(2) = 1, a(n) is largest prime factor of concatenation of a(n - 2) and a(n - 1).

Table of values

List of values