Largest prime < 10*a(n-1), a(1)=31.

A124335

Largest prime < 10*a(n-1), a(1)=31.

Terms

    a(0) =31a(1) =307a(2) =3067a(3) =30661a(4) =306589a(5) =3065863a(6) =30658619a(7) =306586169a(8) =3065861681a(9) =30658616789a(10) =306586167863

External references