145108domain: NAppears in sequencesa(n) = T(2n,n), T given by A026780.at n=8A026781a(n) = T(n, floor(n/2)), T given by A026780.at n=16A026786Numbers k such that A003415(k) == A276085(k) (mod 5^5), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=44A391865