a(1)=2. For n >=2, a(n) = p(n) *(floor(a(n-1)/p(n)) +2), where p(n) is the n-th prime.

Terms

a(0) =2a(1) =6a(2) =15a(3) =28a(4) =44a(5) =65a(6) =85a(7) =114a(8) =138a(9) =174a(10) =217a(11) =259a(12) =328a(13) =387a(14) =470a(15) =530a(16) =590a(17) =671a(18) =804a(19) =923a(20) =1022a(21) =1106a(22) =1245a(23) =1335a(24) =1455a(25) =1616a(26) =1751a(27) =1926a(28) =2071a(29) =2260