A072268 - cp's OEIS frontend

A072268 a(0)=1; a(n+1) = 1 + f(a(n))^2, where f(x) is the largest prime factor of x (A006530).

n	a(n)
0	1
1	2
2	5
3	26
4	170
5	290
6	842
7	177242
8	160802
9	2810
10	78962
11	9223370
12	5033760602
13	2935496262242
14	2154284576409188208716642
15	1379590379356276893461978662419832989306970202
16	10320758390549056348725939119133160378521185060950774444682

[1, 2, 5, 26, 170, 290, 842, 177242, 160802, 2810, 78962, 9223370, 5033760602, 2935496262242, 2154284576409188208716642, 1379590379356276893461978662419832989306970202, 10320758390549056348725939119133160378521185060950774444682]

cp's OEIS Frontend

A072268 a(0)=1; a(n+1) = 1 + f(a(n))^2, where f(x) is the largest prime factor of x (A006530).

Table of values

List of values