Largest prime < 10*a(n-1), a(1)=11.

A124290

Largest prime < 10*a(n-1), a(1)=11.

Terms

    a(0) =11a(1) =109a(2) =1087a(3) =10867a(4) =108649a(5) =1086469a(6) =10864669a(7) =108646667a(8) =1086466657a(9) =10864666531a(10) =108646665307

External references