a(1) = 5 and then the smallest prime that is obtained by placing digits on both sides of the previous term. Or smallest prime that encompasses a(n-1).

A075598

a(1) = 5 and then the smallest prime that is obtained by placing digits on both sides of the previous term. Or smallest prime that encompasses a(n-1).

Terms

    a(0) =5a(1) =151a(2) =11519a(3) =2115193a(4) =121151939a(5) =21211519397

External references