496000domain: NAppears in sequencesa(n) = ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 5.at n=20A160894Starting with 1, multiply the n-th term by 10, then subtract the sum of all terms up to and including the n-th, to make the (n+1)th term.at n=6A176174