37109375domain: NAppears in sequencesa(n) = (2n + 1)*5^n.at n=9A171220(16^(5^n) + (10^n)/2 - 1) mod 10^n: a sequence of trimorphic numbers ending (for n > 1) in 5.at n=7A224478Hypotenuses for which there exist exactly 9 distinct integer triangles.at n=13A290500