331211

Appears in sequences

• a(n) = n*(94 + 5*n + 25*n^2 - 5*n^3 + n^4)/120.at n=34A057703
• Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 6.at n=22A296813