Semiprimeth recurrence: a(0) = 1, a(n+1) = semiprime(a(n)) = A001358(a(n)).

A105999

Semiprimeth recurrence: a(0) = 1, a(n+1) = semiprime(a(n)) = A001358(a(n)).

Terms

    a(0) =1a(1) =4a(2) =10a(3) =26a(4) =77a(5) =235a(6) =779a(7) =2785a(8) =10643a(9) =43697a(10) =192893a(11) =915218a(12) =4657929a(13) =25380749a(14) =147721169a(15) =916036271a(16) =6037442989a(17) =42191467826a(18) =311911160465

External references