69694domain: NAppears in sequencesNumber of powerful numbers not exceeding 2^n.at n=30A062762Semiprimes A001358(k) = p*q such that p*q+p+q and r*s+r+s are consecutive primes, where A001358(k+1)=r*s.at n=16A330478Semiprimes with only semiprime digits, each appearing at least once.at n=38A349275