Position of n-th 4 in A030588.

Terms

a(0) =22a(1) =24a(2) =26a(3) =71a(4) =74a(5) =77a(6) =125a(7) =128a(8) =131a(9) =179a(10) =182a(11) =185a(12) =196a(13) =199a(14) =202a(15) =205a(16) =208a(17) =211a(18) =214a(19) =217a(20) =220a(21) =223a(22) =226a(23) =229a(24) =232a(25) =233a(26) =235a(27) =236a(28) =238a(29) =239