503834

Appears in sequences

• Number of -n..n arrays x(0..4) of 5 elements with sum zero and with zeroth through 4th differences all nonzero.at n=15A200041
• 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=31A296813