99190domain: NAppears in sequencesa(n) = 81n^2 - n.at n=34A157953Frequency of 0's in a constant bit representation of primes.at n=15A158671a(n) = 1225*n^2 - 35.at n=8A158735Positive numbers k of the form x*y where k, x and y have the same set of decimal digits.at n=18A330898