58414domain: NAppears in sequencesa=b=c=0;c(n)=c+n+a;b(n)=b+n+c;a(n)=a+n+b.at n=9A152896Semiprimes 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=13A330478