Positions of even numbers in A024702.

Terms

a(0) =4a(1) =7a(2) =9a(3) =11a(4) =13a(5) =15a(6) =20a(7) =21a(8) =22a(9) =24a(10) =25a(11) =27a(12) =30a(13) =31a(14) =33a(15) =36a(16) =39a(17) =43a(18) =44a(19) =46a(20) =48a(21) =51a(22) =52a(23) =53a(24) =55a(25) =56a(26) =58a(27) =60a(28) =64a(29) =65