a(n)-th prime is the smallest prime containing exactly n 7's.

A037066

a(n)-th prime is the smallest prime containing exactly n 7's.

Terms

    a(0) =1a(1) =4a(2) =59a(3) =275a(4) =4924a(5) =58623a(6) =506877a(7) =4546755a(8) =30224014a(9) =87818618a(10) =2836649805a(11) =14748299309a(12) =251285857122a(13) =603200604933

External references