a(n) = least k > a(n-1) such that A001285(k-1) = A001285(n-1) for n >= 1.

Terms

a(0) =1a(1) =4a(2) =5a(3) =8a(4) =10a(5) =12a(6) =13a(7) =16a(8) =17a(9) =20a(10) =21a(11) =24a(12) =26a(13) =28a(14) =29a(15) =32a(16) =34a(17) =36a(18) =37a(19) =40a(20) =42a(21) =44a(22) =45a(23) =48a(24) =49a(25) =52a(26) =53a(27) =56a(28) =58a(29) =60