4-almost primes equal to the product of two successive semiprimes.

Terms

a(0) =24a(1) =54a(2) =90a(3) =140a(4) =210a(5) =315a(6) =462a(7) =550a(8) =650a(9) =858a(10) =1122a(11) =1190a(12) =1330a(13) =1482a(14) =1794a(15) =2254a(16) =2499a(17) =2805a(18) =3135a(19) =3306a(20) =3596a(21) =4030a(22) =4485a(23) =5106a(24) =5698a(25) =6314a(26) =6970a(27) =7310a(28) =7482a(29) =7917