72170domain: NAppears in sequencesa(n) = 11*3^n-1.at n=8A198646a(n) = 11*9^n-1.at n=4A198968Number of nonnegative integers with property that their base 10/7 expansion has n digits.at n=26A245431a(n) is the least m such that A341284(m) = 2*n*prime(m+1) - prime(m).at n=51A342027