Least number with exactly n odd divisors.

Terms

a(0) =1a(1) =3a(2) =9a(3) =15a(4) =81a(5) =45a(6) =729a(7) =105a(8) =225a(9) =405a(10) =59049a(11) =315a(12) =531441a(13) =3645a(14) =2025a(15) =945a(16) =43046721a(17) =1575a(18) =387420489a(19) =2835a(20) =18225a(21) =295245a(22) =31381059609a(23) =3465a(24) =50625a(25) =2657205a(26) =11025a(27) =25515a(29) =14175a(31) =10395