Position of first occurrence of n in A072347.

Terms

a(0) =0a(1) =3a(2) =7a(3) =27a(4) =15a(5) =427a(6) =55a(7) =31a(8) =215a(9) =219a(10) =111a(11) =119a(12) =63a(13) =431a(14) =443a(15) =471a(16) =439a(17) =223a(18) =239a(19) =1879a(20) =127a(21) =1719a(22) =863a(23) =1755a(24) =891a(25) =887a(26) =879a(27) =3423a(28) =447a(29) =495