50444domain: NAppears in sequencesa(n) = round(10000*log_2(n)).at n=32A004269Number of numbers <= 2^n that are the product of exactly four primes, not necessarily distinct.at n=17A334069E.g.f. satisfies A(x) = 1/(1 + A(x) * log(1 - x))^4.at n=4A377449