Numbers with exactly 4 distinct prime divisors {2,3,5,7}.

Terms

a(0) =210a(1) =420a(2) =630a(3) =840a(4) =1050a(5) =1260a(6) =1470a(7) =1680a(8) =1890a(9) =2100a(10) =2520a(11) =2940a(12) =3150a(13) =3360a(14) =3780a(15) =4200a(16) =4410a(17) =5040a(18) =5250a(19) =5670a(20) =5880a(21) =6300a(22) =6720a(23) =7350a(24) =7560a(25) =8400a(26) =8820a(27) =9450a(28) =10080a(29) =10290