a(n)-th prime is the smallest prime containing exactly n 4's.

A037060

a(n)-th prime is the smallest prime containing exactly n 4's.

Terms

    a(0) =1a(1) =13a(2) =86a(3) =603a(4) =4620a(5) =37299a(6) =1533327a(7) =22568442a(8) =23574105a(9) =210014510a(10) =1893613727a(11) =17241353173a(12) =493582559244

External references