Number of n-digit numbers that have exactly 4 divisors.

A379567

Number of n-digit numbers that have exactly 4 divisors.

Terms

    a(0) =2a(1) =30a(2) =260a(3) =2316a(4) =20719a(5) =186565a(6) =1694033a(7) =15522194a(8) =143359184a(9) =1332981873a(10) =12466196499a(11) =117165976234

External references