42681

Appears in sequences

• Integers k such that nextprime(k^5) - prevprime(k^5) = 4.at n=34A090123
• Number of unlabeled loopless multigraphs with n nodes of degree 4 or less.at n=8A333895
• a(1)=2; thereafter a(n) = a(n-1) + gpf(a(n-1)) - 1, where gpf = greatest prime factor = A006530.at n=34A389408