a(n) is the least positive integer divisible by exactly n primitive nondeficient numbers (A006039).

Terms

a(0) =1a(1) =6a(2) =60a(3) =140a(4) =420a(5) =3780a(6) =17160a(7) =28600a(8) =40040a(9) =138600a(10) =120120a(11) =180180a(12) =300300a(13) =360360a(14) =600600a(15) =1351350a(16) =900900a(17) =4144140a(18) =1801800a(19) =3063060a(20) =5405400a(21) =6126120a(22) =8558550a(23) =7657650a(24) =19399380a(25) =20720700a(26) =17117100a(27) =15315300a(28) =29099070a(29) =30630600