Smallest number having n divisors ending with 1 or 9.

Terms

a(0) =1a(1) =9a(2) =63a(3) =99a(4) =441a(5) =693a(6) =5103a(7) =1881a(8) =5733a(9) =4851a(10) =35721a(11) =9009a(12) =194481a(13) =56133a(14) =51597a(15) =27027a(16) =2893401a(17) =63063a(18) =2711943423a(19) =81081a(20) =464373a(21) =392931a(22) =670761a(23) =153153a(24) =2528253a(25) =2139291a(26) =693693a(27) =729729a(28) =18983603961a(29) =567567