70320domain: NAppears in sequencesNumber of primes less than 10^n with initial digit 9.at n=6A073509G.f.: exp( Sum_{n>=1} (x^n/n) * Sum_{d|n} d*sigma(n/d,d) ).at n=20A198301Number of length-n quasiperiodic binary strings.at n=29A320434