a(1) = 19, a(n) is the smallest prime obtained by inserting digits between every pair of digits of a(n-1).

A080442

a(1) = 19, a(n) is the smallest prime obtained by inserting digits between every pair of digits of a(n-1).

Terms

    a(0) =19a(1) =109a(2) =10009a(3) =100000039

External references