a(n) is the least practical number that is divisible by prime(n).

Terms

a(0) =2a(1) =6a(2) =20a(3) =28a(4) =66a(5) =78a(6) =204a(7) =228a(8) =276a(9) =348a(10) =496a(11) =666a(12) =820a(13) =860a(14) =1128a(15) =1272a(16) =1416a(17) =1464a(18) =2010a(19) =2130a(20) =2190a(21) =2844a(22) =2988a(23) =3204a(24) =4074a(25) =4848a(26) =4944a(27) =5136a(28) =5232a(29) =5424