a(1) = 11 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).

A075600

a(1) = 11 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) =11a(1) =1117a(2) =211177a(3) =12111773a(4) =1121117731

External references