a(n) = lcm(n, d(n)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =10a(5) =12a(6) =14a(7) =8a(8) =9a(9) =20a(10) =22a(11) =12a(12) =26a(13) =28a(14) =60a(15) =80a(16) =34a(17) =18a(18) =38a(19) =60a(20) =84a(21) =44a(22) =46a(23) =24a(24) =75a(25) =52a(26) =108a(27) =84a(28) =58a(29) =120