a(n) is the largest prime < 10*a(n-1) for n > 1, with a(1) = 2.

A124262

a(n) is the largest prime < 10*a(n-1) for n > 1, with a(1) = 2.

Terms

    a(0) =2a(1) =19a(2) =181a(3) =1801a(4) =17989a(5) =179849a(6) =1798487a(7) =17984833a(8) =179848309a(9) =1798483067a(10) =17984830667a(11) =179848306667

External references