a(0)=1 and for n>0: a(n) = if gcd(a(n-1),n)>1 then lcm(a(n-1),n) else a(n-1)+n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =5a(4) =9a(5) =14a(6) =42a(7) =42a(8) =168a(9) =504a(10) =2520a(11) =2531a(12) =2543a(13) =2556a(14) =17892a(15) =89460a(16) =357840a(17) =357857a(18) =357875a(19) =357894a(20) =3578940a(21) =25052580a(22) =275578380a(23) =275578403a(24) =275578427a(25) =275578452a(26) =3582519876a(27) =10747559628a(28) =75232917396a(29) =75232917425