n*prevprime(n).

Terms

a(0) =6a(1) =12a(2) =15a(3) =30a(4) =35a(5) =56a(6) =63a(7) =70a(8) =77a(9) =132a(10) =143a(11) =182a(12) =195a(13) =208a(14) =221a(15) =306a(16) =323a(17) =380a(18) =399a(19) =418a(20) =437a(21) =552a(22) =575a(23) =598a(24) =621a(25) =644a(26) =667a(27) =870a(28) =899a(29) =992