Number of k < 10^n such that A047988(k) = 1.

A213530

Number of k < 10^n such that A047988(k) = 1.

Terms

    a(0) =6a(1) =71a(2) =686a(3) =6598a(4) =63449a(5) =614400a(6) =5952657a(7) =58088295a(8) =568932663a(9) =5588087493a(10) =54968844332a(11) =541664112990

External references