Triangular numbers which are 9-almost primes.

Terms

a(0) =25200a(1) =61776a(2) =195000a(3) =248160a(4) =270480a(5) =295296a(6) =306936a(7) =320400a(8) =346528a(9) =373680a(10) =400960a(11) =446040a(12) =460320a(13) =461280a(14) =499500a(15) =662976a(16) =664128a(17) =749700a(18) =818560a(19) =902496a(20) =903840a(21) =946000a(22) =1037520a(23) =1155960a(24) =1185030a(25) =1664400a(26) =1721440a(27) =1873080a(28) =1888596