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.
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.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =23a(4) =19a(5) =773a(6) =13a(7) =25771a(8) =1325771a(9) =85903775257
External references
- oeis: A280894