87807

Appears in sequences

• Number of distinct values taken by 10^10^...^10 (with n 10's and parentheses inserted in all possible ways).at n=14A145550
• 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 = 5.at n=38A296812