Numbers k such that 1 and 7 occur juxtaposed in the base-9 representation of k but not of k+1.

Terms

a(0) =16a(1) =64a(2) =97a(3) =152a(4) =178a(5) =226a(6) =259a(7) =307a(8) =340a(9) =388a(10) =421a(11) =469a(12) =502a(13) =550a(14) =584a(15) =631a(16) =664a(17) =712a(18) =745a(19) =793a(20) =826a(21) =881a(22) =907a(23) =955a(24) =988a(25) =1036a(26) =1069a(27) =1117a(28) =1150a(29) =1198