Numbers of the form p^4*q*r*s where p, q, r, and s are distinct primes.

Terms

a(0) =1680a(1) =2640a(2) =3120a(3) =3696a(4) =4080a(5) =4368a(6) =4560a(7) =5520a(8) =5670a(9) =5712a(10) =6160a(11) =6384a(12) =6864a(13) =6960a(14) =7280a(15) =7440a(16) =7728a(17) =8880a(18) =8910a(19) =8976a(20) =9520a(21) =9744a(22) =9840a(23) =10032a(24) =10320a(25) =10416a(26) =10530a(27) =10608a(28) =10640a(29) =11280