a(n) is the smallest number k such that A002487(k) = n.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =9a(5) =11a(6) =33a(7) =19a(8) =21a(9) =35a(10) =39a(11) =37a(12) =45a(13) =43a(14) =69a(15) =73a(16) =93a(17) =77a(18) =75a(19) =83a(20) =189a(21) =85a(22) =141a(23) =139a(24) =153a(25) =151a(26) =147a(27) =155a(28) =267a(29) =149