Numbers with prime factorization pqrs^2t^2.

Terms

a(0) =13860a(1) =16380a(2) =21420a(3) =23100a(4) =23940a(5) =25740a(6) =27300a(7) =28980a(8) =32340a(9) =33660a(10) =34650a(11) =35700a(12) =36036a(13) =36540a(14) =37620a(15) =38220a(16) =39060a(17) =39780a(18) =39900a(19) =40950a(20) =42900a(21) =44460a(22) =45540a(23) =46620a(24) =47124a(25) =48300a(26) =48510a(27) =49980a(28) =50820a(29) =51660