a(1) = 7; thereafter a(n) = the smallest prime of the form d0...0a(n-1), where d is a single digit, or 0 if no such prime exists.

A077715

a(1) = 7; thereafter a(n) = the smallest prime of the form d0...0a(n-1), where d is a single digit, or 0 if no such prime exists.

Terms

    a(0) =7a(1) =17a(2) =317a(3) =6317a(4) =26317a(5) =126317a(6) =2126317a(7) =72126317a(8) =372126317a(9) =5372126317a(10) =305372126317

External references