Numbers that are divisible by at least 4 primes (counted with multiplicity).

Terms

a(0) =16a(1) =24a(2) =32a(3) =36a(4) =40a(5) =48a(6) =54a(7) =56a(8) =60a(9) =64a(10) =72a(11) =80a(12) =81a(13) =84a(14) =88a(15) =90a(16) =96a(17) =100a(18) =104a(19) =108a(20) =112a(21) =120a(22) =126a(23) =128a(24) =132a(25) =135a(26) =136a(27) =140a(28) =144a(29) =150