a(n) = smallest number whose arithmetic derivative has exactly n prime factors.

Terms

a(0) =6a(1) =4a(2) =8a(3) =12a(4) =16a(5) =92a(6) =64a(7) =144a(8) =508a(9) =256a(10) =1024a(11) =3392a(12) =8192a(13) =3072a(14) =13248a(15) =19456a(16) =114688a(17) =81920a(18) =65536a(19) =262144a(20) =671744a(21) =1048576a(22) =983040a(23) =1835008a(24) =5296128a(25) =9437184a(26) =16777216a(27) =54525952a(28) =121634816a(29) =201326592