Position of n-th 7 in A031067.

Terms

a(0) =14a(1) =25a(2) =32a(3) =37a(4) =62a(5) =64a(6) =65a(7) =87a(8) =88a(9) =100a(10) =133a(11) =143a(12) =152a(13) =154a(14) =165a(15) =167a(16) =173a(17) =183a(18) =191a(19) =192a(20) =199a(21) =207a(22) =208a(23) =214a(24) =233a(25) =243a(26) =252a(27) =257a(28) =280a(29) =282