Position of n-th 3 in A030496.

Terms

a(0) =6a(1) =9a(2) =13a(3) =17a(4) =19a(5) =23a(6) =25a(7) =29a(8) =34a(9) =39a(10) =42a(11) =47a(12) =48a(13) =52a(14) =56a(15) =60a(16) =64a(17) =68a(18) =74a(19) =79a(20) =81a(21) =85a(22) =91a(23) =94a(24) =98a(25) =103a(26) =105a(27) =109a(28) =115a(29) =118