a(n) is the smallest 5-rough number with exactly n divisors.

Terms

a(0) =1a(1) =5a(2) =25a(3) =35a(4) =625a(5) =175a(6) =15625a(7) =385a(8) =1225a(9) =4375a(10) =9765625a(11) =1925a(12) =244140625a(13) =109375a(14) =30625a(15) =5005a(16) =152587890625a(17) =13475a(19) =48125a(20) =765625a(21) =68359375a(23) =25025a(24) =1500625a(25) =1708984375a(26) =148225a(27) =1203125a(29) =336875